functions.php de @juniorfisio

<?php
/**
* Main WordPress API
*
* @package WordPress
*/

require( ABSPATH . WPINC . ‘/option.php’ );

/**
* Convert given date string into a different format.
*
* $format should be either a PHP date format string, e.g. ‘U’ for a Unix
* timestamp, or ‘G’ for a Unix timestamp assuming that $date is GMT.
*
* If $translate is true then the given date and format string will
* be passed to date_i18n() for translation.
*
* @since 0.71
*
* @param string $format Format of the date to return.
* @param string $date Date string to convert.
* @param bool $translate Whether the return date should be translated. Default true.
* @return string|int|bool Formatted date string or Unix timestamp. False if $date is empty.
*/
function mysql2date( $format, $date, $translate = true ) {
if ( empty( $date ) )
return false;

if ( ‘G’ == $format )
return strtotime( $date . ‘ +0000’ );

$i = strtotime( $date );

if ( ‘U’ == $format )
return $i;

if ( $translate )
return date_i18n( $format, $i );
else
return date( $format, $i );
}

/**
* Retrieve the current time based on specified type.
*
* The ‘mysql’ type will return the time in the format for MySQL DATETIME field.
* The ‘timestamp’ type will return the current timestamp.
* Other strings will be interpreted as PHP date formats (e.g. ‘Y-m-d’).
*
* If $gmt is set to either ‘1’ or ‘true’, then both types will use GMT time.
* if $gmt is false, the output is adjusted with the GMT offset in the WordPress option.
*
* @since 1.0.0
*
* @param string $type Type of time to retrieve. Accepts ‘mysql’, ‘timestamp’, or PHP date
* format string (e.g. ‘Y-m-d’).
* @param int|bool $gmt Optional. Whether to use GMT timezone. Default false.
* @return int|string Integer if $type is ‘timestamp’, string otherwise.
*/
function current_time( $type, $gmt = 0 ) {
switch ( $type ) {
case ‘mysql’:
return ( $gmt ) ? gmdate( ‘Y-m-d H:i:s’ ) : gmdate( ‘Y-m-d H:i:s’, ( time() + ( get_option( ‘gmt_offset’ ) * HOUR_IN_SECONDS ) ) );
case ‘timestamp’:
return ( $gmt ) ? time() : time() + ( get_option( ‘gmt_offset’ ) * HOUR_IN_SECONDS );
default:
return ( $gmt ) ? date( $type ) : date( $type, time() + ( get_option( ‘gmt_offset’ ) * HOUR_IN_SECONDS ) );
}
}

/**
* Retrieve the date in localized format, based on timestamp.
*
* If the locale specifies the locale month and weekday, then the locale will
* take over the format for the date. If it isn’t, then the date format string
* will be used instead.
*
* @since 0.71
*
* @global WP_Locale $wp_locale
*
* @param string $dateformatstring Format to display the date.
* @param bool|int $unixtimestamp Optional. Unix timestamp. Default false.
* @param bool $gmt Optional. Whether to use GMT timezone. Default false.
*
* @return string The date, translated if locale specifies it.
*/
function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
global $wp_locale;
$i = $unixtimestamp;

if ( false === $i ) {
if ( ! $gmt )
$i = current_time( ‘timestamp’ );
else
$i = time();
// we should not let date() interfere with our
// specially computed timestamp
$gmt = true;
}

/*
* Store original value for language with untypical grammars.
* See https://core.trac.wordpress.org/ticket/9396
*/
$req_format = $dateformatstring;

$datefunc = $gmt? ‘gmdate’ : ‘date’;

if ( ( !empty( $wp_locale->month ) ) && ( !empty( $wp_locale->weekday ) ) ) {
$datemonth = $wp_locale->get_month( $datefunc( ‘m’, $i ) );
$datemonth_abbrev = $wp_locale->get_month_abbrev( $datemonth );
$dateweekday = $wp_locale->get_weekday( $datefunc( ‘w’, $i ) );
$dateweekday_abbrev = $wp_locale->get_weekday_abbrev( $dateweekday );
$datemeridiem = $wp_locale->get_meridiem( $datefunc( ‘a’, $i ) );
$datemeridiem_capital = $wp_locale->get_meridiem( $datefunc( ‘A’, $i ) );
$dateformatstring = ‘ ‘.$dateformatstring;
$dateformatstring = preg_replace( “/([^\\\])D/”, “\\1” . backslashit( $dateweekday_abbrev ), $dateformatstring );
$dateformatstring = preg_replace( “/([^\\\])F/”, “\\1” . backslashit( $datemonth ), $dateformatstring );
$dateformatstring = preg_replace( “/([^\\\])l/”, “\\1” . backslashit( $dateweekday ), $dateformatstring );
$dateformatstring = preg_replace( “/([^\\\])M/”, “\\1” . backslashit( $datemonth_abbrev ), $dateformatstring );
$dateformatstring = preg_replace( “/([^\\\])a/”, “\\1” . backslashit( $datemeridiem ), $dateformatstring );
$dateformatstring = preg_replace( “/([^\\\])A/”, “\\1” . backslashit( $datemeridiem_capital ), $dateformatstring );

$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
}
$timezone_formats = array( ‘P’, ‘I’, ‘O’, ‘T’, ‘Z’, ‘e’ );
$timezone_formats_re = implode( ‘|’, $timezone_formats );
if ( preg_match( “/$timezone_formats_re/”, $dateformatstring ) ) {
$timezone_string = get_option( ‘timezone_string’ );
if ( $timezone_string ) {
$timezone_object = timezone_open( $timezone_string );
$date_object = date_create( null, $timezone_object );
foreach ( $timezone_formats as $timezone_format ) {
if ( false !== strpos( $dateformatstring, $timezone_format ) ) {
$formatted = date_format( $date_object, $timezone_format );
$dateformatstring = ‘ ‘.$dateformatstring;
$dateformatstring = preg_replace( “/([^\\\])$timezone_format/”, “\\1” . backslashit( $formatted ), $dateformatstring );
$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
}
}
}
}
$j = @$datefunc( $dateformatstring, $i );

/**
* Filters the date formatted based on the locale.
*
* @since 2.8.0
*
* @param string $j Formatted date string.
* @param string $req_format Format to display the date.
* @param int $i Unix timestamp.
* @param bool $gmt Whether to convert to GMT for time. Default false.
*/
$j = apply_filters( ‘date_i18n’, $j, $req_format, $i, $gmt );
return $j;
}

/**
* Determines if the date should be declined.
*
* If the locale specifies that month names require a genitive case in certain
* formats (like ‘j F Y’), the month name will be replaced with a correct form.
*
* @since 4.4.0
*
* @param string $date Formatted date string.
* @return string The date, declined if locale specifies it.
*/
function wp_maybe_decline_date( $date ) {
global $wp_locale;

// i18n functions are not available in SHORTINIT mode
if ( ! function_exists( ‘_x’ ) ) {
return $date;
}

/* translators: If months in your language require a genitive case,
* translate this to ‘on’. Do not translate into your own language.
*/
if ( ‘on’ === _x( ‘off’, ‘decline months names: on or off’ ) ) {
// Match a format like ‘j F Y’ or ‘j. F’
if ( @preg_match( ‘#^\d{1,2}\.? [^\d ]+#u’, $date ) ) {
$months = $wp_locale->month;
$months_genitive = $wp_locale->month_genitive;

foreach ( $months as $key => $month ) {
$months[ $key ] = ‘# ‘ . $month . ‘( |$)#u’;
}

foreach ( $months_genitive as $key => $month ) {
$months_genitive[ $key ] = ‘ ‘ . $month . ‘$1’;
}

$date = preg_replace( $months, $months_genitive, $date );
}
}

// Used for locale-specific rules
$locale = get_locale();

if ( ‘ca’ === $locale ) {
// ” de abril| de agost| de octubre…” -> ” d’abril| d’agost| d’octubre…”
$date = preg_replace( ‘# de ([ao])#i’, ” d’\\1″, $date );
}

return $date;
}

/**
* Convert float number to format based on the locale.
*
* @since 2.3.0
*
* @global WP_Locale $wp_locale
*
* @param float $number The number to convert based on locale.
* @param int $decimals Optional. Precision of the number of decimal places. Default 0.
* @return string Converted number in string format.
*/
function number_format_i18n( $number, $decimals = 0 ) {
global $wp_locale;

if ( isset( $wp_locale ) ) {
$formatted = number_format( $number, absint( $decimals ), $wp_locale->number_format[‘decimal_point’], $wp_locale->number_format[‘thousands_sep’] );
} else {
$formatted = number_format( $number, absint( $decimals ) );
}

/**
* Filters the number formatted based on the locale.
*
* @since 2.8.0
*
* @param string $formatted Converted number in string format.
*/
return apply_filters( ‘number_format_i18n’, $formatted );
}

/**
* Convert number of bytes largest unit bytes will fit into.
*
* It is easier to read 1 KB than 1024 bytes and 1 MB than 1048576 bytes. Converts
* number of bytes to human readable number by taking the number of that unit
* that the bytes will go into it. Supports TB value.
*
* Please note that integers in PHP are limited to 32 bits, unless they are on
* 64 bit architecture, then they have 64 bit size. If you need to place the
* larger size then what PHP integer type will hold, then use a string. It will
* be converted to a double, which should always have 64 bit length.
*
* Technically the correct unit names for powers of 1024 are KiB, MiB etc.
*
* @since 2.3.0
*
* @param int|string $bytes Number of bytes. Note max integer size for integers.
* @param int $decimals Optional. Precision of number of decimal places. Default 0.
* @return string|false False on failure. Number string on success.
*/
function size_format( $bytes, $decimals = 0 ) {
$quant = array(
‘TB’ => TB_IN_BYTES,
‘GB’ => GB_IN_BYTES,
‘MB’ => MB_IN_BYTES,
‘KB’ => KB_IN_BYTES,
‘B’ => 1,
);

if ( 0 === $bytes ) {
return number_format_i18n( 0, $decimals ) . ‘ B’;
}

foreach ( $quant as $unit => $mag ) {
if ( doubleval( $bytes ) >= $mag ) {
return number_format_i18n( $bytes / $mag, $decimals ) . ‘ ‘ . $unit;
}
}

return false;
}

/**
* Get the week start and end from the datetime or date string from MySQL.
*
* @since 0.71
*
* @param string $mysqlstring Date or datetime field type from MySQL.
* @param int|string $start_of_week Optional. Start of the week as an integer. Default empty string.
* @return array Keys are ‘start’ and ‘end’.
*/
function get_weekstartend( $mysqlstring, $start_of_week = ” ) {
// MySQL string year.
$my = substr( $mysqlstring, 0, 4 );

// MySQL string month.
$mm = substr( $mysqlstring, 8, 2 );

// MySQL string day.
$md = substr( $mysqlstring, 5, 2 );

// The timestamp for MySQL string day.
$day = mktime( 0, 0, 0, $md, $mm, $my );

// The day of the week from the timestamp.
$weekday = date( ‘w’, $day );

if ( !is_numeric($start_of_week) )
$start_of_week = get_option( ‘start_of_week’ );

if ( $weekday < $start_of_week )
$weekday += 7;

// The most recent week start day on or before $day.
$start = $day – DAY_IN_SECONDS * ( $weekday – $start_of_week );

// $start + 1 week – 1 second.
$end = $start + WEEK_IN_SECONDS – 1;
return compact( ‘start’, ‘end’ );
}

/**
* Unserialize value only if it was serialized.
*
* @since 2.0.0
*
* @param string $original Maybe unserialized original, if is needed.
* @return mixed Unserialized data can be any type.
*/
function maybe_unserialize( $original ) {
if ( is_serialized( $original ) ) // don’t attempt to unserialize data that wasn’t serialized going in
return @unserialize( $original );
return $original;
}

/**
* Check value to find if it was serialized.
*
* If $data is not an string, then returned value will always be false.
* Serialized data is always a string.
*
* @since 2.0.5
*
* @param string $data Value to check to see if was serialized.
* @param bool $strict Optional. Whether to be strict about the end of the string. Default true.
* @return bool False if not serialized and true if it was.
*/
function is_serialized( $data, $strict = true ) {
// if it isn’t a string, it isn’t serialized.
if ( ! is_string( $data ) ) {
return false;
}
$data = trim( $data );
if ( ‘N;’ == $data ) {
return true;
}
if ( strlen( $data ) < 4 ) {
return false;
}
if ( ‘:’ !== $data[1] ) {
return false;
}
if ( $strict ) {
$lastc = substr( $data, -1 );
if ( ‘;’ !== $lastc && ‘}’ !== $lastc ) {
return false;
}
} else {
$semicolon = strpos( $data, ‘;’ );
$brace = strpos( $data, ‘}’ );
// Either ; or } must exist.
if ( false === $semicolon && false === $brace )
return false;
// But neither must be in the first X characters.
if ( false !== $semicolon && $semicolon < 3 )
return false;
if ( false !== $brace && $brace < 4 )
return false;
}
$token = $data[0];
switch ( $token ) {
case ‘s’ :
if ( $strict ) {
if ( ‘”‘ !== substr( $data, -2, 1 ) ) {
return false;
}
} elseif ( false === strpos( $data, ‘”‘ ) ) {
return false;
}
// or else fall through
case ‘a’ :
case ‘O’ :
return (bool) preg_match( “/^{$token}:[0-9]+:/s”, $data );
case ‘b’ :
case ‘i’ :
case ‘d’ :
$end = $strict ? ‘$’ : ”;
return (bool) preg_match( “/^{$token}:[0-9.E-]+;$end/”, $data );
}
return false;
}

/**
* Check whether serialized data is of string type.
*
* @since 2.0.5
*
* @param string $data Serialized data.
* @return bool False if not a serialized string, true if it is.
*/
function is_serialized_string( $data ) {
// if it isn’t a string, it isn’t a serialized string.
if ( ! is_string( $data ) ) {
return false;
}
$data = trim( $data );
if ( strlen( $data ) < 4 ) {
return false;
} elseif ( ‘:’ !== $data[1] ) {
return false;
} elseif ( ‘;’ !== substr( $data, -1 ) ) {
return false;
} elseif ( $data[0] !== ‘s’ ) {
return false;
} elseif ( ‘”‘ !== substr( $data, -2, 1 ) ) {
return false;
} else {
return true;
}
}

/**
* Serialize data, if needed.
*
* @since 2.0.5
*
* @param string|array|object $data Data that might be serialized.
* @return mixed A scalar data
*/
function maybe_serialize( $data ) {
if ( is_array( $data ) || is_object( $data ) )
return serialize( $data );

// Double serialization is required for backward compatibility.
// See https://core.trac.wordpress.org/ticket/12930
// Also the world will end. See WP 3.6.1.
if ( is_serialized( $data, false ) )
return serialize( $data );

return $data;
}

/**
* Retrieve post title from XMLRPC XML.
*
* If the title element is not part of the XML, then the default post title from
* the $post_default_title will be used instead.
*
* @since 0.71
*
* @global string $post_default_title Default XML-RPC post title.
*
* @param string $content XMLRPC XML Request content
* @return string Post title
*/
function xmlrpc_getposttitle( $content ) {
global $post_default_title;
if ( preg_match( ‘/<title>(.+?)<\/title>/is’, $content, $matchtitle ) ) {
$post_title = $matchtitle[1];
} else {
$post_title = $post_default_title;
}
return $post_title;
}

/**
* Retrieve the post category or categories from XMLRPC XML.
*
* If the category element is not found, then the default post category will be
* used. The return type then would be what $post_default_category. If the
* category is found, then it will always be an array.
*
* @since 0.71
*
* @global string $post_default_category Default XML-RPC post category.
*
* @param string $content XMLRPC XML Request content
* @return string|array List of categories or category name.
*/
function xmlrpc_getpostcategory( $content ) {
global $post_default_category;
if ( preg_match( ‘/<category>(.+?)<\/category>/is’, $content, $matchcat ) ) {
$post_category = trim( $matchcat[1], ‘,’ );
$post_category = explode( ‘,’, $post_category );
} else {
$post_category = $post_default_category;
}
return $post_category;
}

/**
* XMLRPC XML content without title and category elements.
*
* @since 0.71
*
* @param string $content XML-RPC XML Request content.
* @return string XMLRPC XML Request content without title and category elements.
*/
function xmlrpc_removepostdata( $content ) {
$content = preg_replace( ‘/<title>(.+?)<\/title>/si’, ”, $content );
$content = preg_replace( ‘/<category>(.+?)<\/category>/si’, ”, $content );
$content = trim( $content );
return $content;
}

/**
* Use RegEx to extract URLs from arbitrary content.
*
* @since 3.7.0
*
* @param string $content Content to extract URLs from.
* @return array URLs found in passed string.
*/
function wp_extract_urls( $content ) {
preg_match_all(
“#([\”‘]?)(”
. “(?:([\w-]+:)?//?)”
. “[^\s()<>]+”
. “[.]”
. “(?:”
. “\([\w\d]+\)|”
. “(?:”
. “[^`!()\[\]{};:’\”.,<>«»“”‘’\s]|”
. “(?:[:]\d+)?/?”
. “)+”
. “)”
. “)\\1#”,
$content,
$post_links
);

$post_links = array_unique( array_map( ‘html_entity_decode’, $post_links[2] ) );

return array_values( $post_links );
}

/**
* Check content for video and audio links to add as enclosures.
*
* Will not add enclosures that have already been added and will
* remove enclosures that are no longer in the post. This is called as
* pingbacks and trackbacks.
*
* @since 1.5.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $content Post Content.
* @param int $post_ID Post ID.
*/
function do_enclose( $content, $post_ID ) {
global $wpdb;

//TODO: Tidy this ghetto code up and make the debug code optional
include_once( ABSPATH . WPINC . ‘/class-IXR.php’ );

$post_links = array();

$pung = get_enclosed( $post_ID );

$post_links_temp = wp_extract_urls( $content );

foreach ( $pung as $link_test ) {
if ( ! in_array( $link_test, $post_links_temp ) ) { // link no longer in post
$mids = $wpdb->get_col( $wpdb->prepare(“SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = ‘enclosure’ AND meta_value LIKE %s”, $post_ID, $wpdb->esc_like( $link_test ) . ‘%’) );
foreach ( $mids as $mid )
delete_metadata_by_mid( ‘post’, $mid );
}
}

foreach ( (array) $post_links_temp as $link_test ) {
if ( !in_array( $link_test, $pung ) ) { // If we haven’t pung it already
$test = @parse_url( $link_test );
if ( false === $test )
continue;
if ( isset( $test[‘query’] ) )
$post_links[] = $link_test;
elseif ( isset($test[‘path’]) && ( $test[‘path’] != ‘/’ ) && ($test[‘path’] != ” ) )
$post_links[] = $link_test;
}
}

/**
* Filters the list of enclosure links before querying the database.
*
* Allows for the addition and/or removal of potential enclosures to save
* to postmeta before checking the database for existing enclosures.
*
* @since 4.4.0
*
* @param array $post_links An array of enclosure links.
* @param int $post_ID Post ID.
*/
$post_links = apply_filters( ‘enclosure_links’, $post_links, $post_ID );

foreach ( (array) $post_links as $url ) {
if ( $url != ” && !$wpdb->get_var( $wpdb->prepare( “SELECT post_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = ‘enclosure’ AND meta_value LIKE %s”, $post_ID, $wpdb->esc_like( $url ) . ‘%’ ) ) ) {

if ( $headers = wp_get_http_headers( $url) ) {
$len = isset( $headers[‘content-length’] ) ? (int) $headers[‘content-length’] : 0;
$type = isset( $headers[‘content-type’] ) ? $headers[‘content-type’] : ”;
$allowed_types = array( ‘video’, ‘audio’ );

// Check to see if we can figure out the mime type from
// the extension
$url_parts = @parse_url( $url );
if ( false !== $url_parts ) {
$extension = pathinfo( $url_parts[‘path’], PATHINFO_EXTENSION );
if ( !empty( $extension ) ) {
foreach ( wp_get_mime_types() as $exts => $mime ) {
if ( preg_match( ‘!^(‘ . $exts . ‘)$!i’, $extension ) ) {
$type = $mime;
break;
}
}
}
}

if ( in_array( substr( $type, 0, strpos( $type, “/” ) ), $allowed_types ) ) {
add_post_meta( $post_ID, ‘enclosure’, “$url\n$len\n$mime\n” );
}
}
}
}
}

/**
* Retrieve HTTP Headers from URL.
*
* @since 1.5.1
*
* @param string $url URL to retrieve HTTP headers from.
* @param bool $deprecated Not Used.
* @return bool|string False on failure, headers on success.
*/
function wp_get_http_headers( $url, $deprecated = false ) {
if ( !empty( $deprecated ) )
_deprecated_argument( __FUNCTION__, ‘2.7.0’ );

$response = wp_safe_remote_head( $url );

if ( is_wp_error( $response ) )
return false;

return wp_remote_retrieve_headers( $response );
}

/**
* Whether the publish date of the current post in the loop is different from the
* publish date of the previous post in the loop.
*
* @since 0.71
*
* @global string $currentday The day of the current post in the loop.
* @global string $previousday The day of the previous post in the loop.
*
* @return int 1 when new day, 0 if not a new day.
*/
function is_new_day() {
global $currentday, $previousday;
if ( $currentday != $previousday )
return 1;
else
return 0;
}

/**
* Build URL query based on an associative and, or indexed array.
*
* This is a convenient function for easily building url queries. It sets the
* separator to ‘&’ and uses _http_build_query() function.
*
* @since 2.3.0
*
* @see _http_build_query() Used to build the query
* @link https://secure.php.net/manual/en/function.http-build-query.php for more on what
* http_build_query() does.
*
* @param array $data URL-encode key/value pairs.
* @return string URL-encoded string.
*/
function build_query( $data ) {
return _http_build_query( $data, null, ‘&’, ”, false );
}

/**
* From php.net (modified by Mark Jaquith to behave like the native PHP5 function).
*
* @since 3.2.0
* @access private
*
* @see https://secure.php.net/manual/en/function.http-build-query.php
*
* @param array|object $data An array or object of data. Converted to array.
* @param string $prefix Optional. Numeric index. If set, start parameter numbering with it.
* Default null.
* @param string $sep Optional. Argument separator; defaults to ‘arg_separator.output’.
* Default null.
* @param string $key Optional. Used to prefix key name. Default empty.
* @param bool $urlencode Optional. Whether to use urlencode() in the result. Default true.
*
* @return string The query string.
*/
function _http_build_query( $data, $prefix = null, $sep = null, $key = ”, $urlencode = true ) {
$ret = array();

foreach ( (array) $data as $k => $v ) {
if ( $urlencode)
$k = urlencode($k);
if ( is_int($k) && $prefix != null )
$k = $prefix.$k;
if ( !empty($key) )
$k = $key . ‘%5B’ . $k . ‘%5D’;
if ( $v === null )
continue;
elseif ( $v === false )
$v = ‘0’;

if ( is_array($v) || is_object($v) )
array_push($ret,_http_build_query($v, ”, $sep, $k, $urlencode));
elseif ( $urlencode )
array_push($ret, $k.’=’.urlencode($v));
else
array_push($ret, $k.’=’.$v);
}

if ( null === $sep )
$sep = ini_get(‘arg_separator.output’);

return implode($sep, $ret);
}

/**
* Retrieves a modified URL query string.
*
* You can rebuild the URL and append query variables to the URL query by using this function.
* There are two ways to use this function; either a single key and value, or an associative array.
*
* Using a single key and value:
*
* add_query_arg( ‘key’, ‘value’, ‘http://example.com’ );
*
* Using an associative array:
*
* add_query_arg( array(
* ‘key1’ => ‘value1’,
* ‘key2’ => ‘value2’,
* ), ‘http://example.com’ );
*
* Omitting the URL from either use results in the current URL being used
* (the value of $_SERVER['REQUEST_URI']).
*
* Values are expected to be encoded appropriately with urlencode() or rawurlencode().
*
* Setting any query variable’s value to boolean false removes the key (see remove_query_arg()).
*
* Important: The return value of add_query_arg() is not escaped by default. Output should be
* late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting
* (XSS) attacks.
*
* @since 1.5.0
*
* @param string|array $key Either a query variable key, or an associative array of query variables.
* @param string $value Optional. Either a query variable value, or a URL to act upon.
* @param string $url Optional. A URL to act upon.
* @return string New URL query string (unescaped).
*/
function add_query_arg() {
$args = func_get_args();
if ( is_array( $args[0] ) ) {
if ( count( $args ) < 2 || false === $args[1] )
$uri = $_SERVER[‘REQUEST_URI’];
else
$uri = $args[1];
} else {
if ( count( $args ) < 3 || false === $args[2] )
$uri = $_SERVER[‘REQUEST_URI’];
else
$uri = $args[2];
}

if ( $frag = strstr( $uri, ‘#’ ) )
$uri = substr( $uri, 0, -strlen( $frag ) );
else
$frag = ”;

if ( 0 === stripos( $uri, ‘http://’ ) ) {
$protocol = ‘http://’;
$uri = substr( $uri, 7 );
} elseif ( 0 === stripos( $uri, ‘https://’ ) ) {
$protocol = ‘https://’;
$uri = substr( $uri, 8 );
} else {
$protocol = ”;
}

if ( strpos( $uri, ‘?’ ) !== false ) {
list( $base, $query ) = explode( ‘?’, $uri, 2 );
$base .= ‘?’;
} elseif ( $protocol || strpos( $uri, ‘=’ ) === false ) {
$base = $uri . ‘?’;
$query = ”;
} else {
$base = ”;
$query = $uri;
}

wp_parse_str( $query, $qs );
$qs = urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
if ( is_array( $args[0] ) ) {
foreach ( $args[0] as $k => $v ) {
$qs[ $k ] = $v;
}
} else {
$qs[ $args[0] ] = $args[1];
}

foreach ( $qs as $k => $v ) {
if ( $v === false )
unset( $qs[$k] );
}

$ret = build_query( $qs );
$ret = trim( $ret, ‘?’ );
$ret = preg_replace( ‘#=(&|$)#’, ‘$1’, $ret );
$ret = $protocol . $base . $ret . $frag;
$ret = rtrim( $ret, ‘?’ );
return $ret;
}

/**
* Removes an item or items from a query string.
*
* @since 1.5.0
*
* @param string|array $key Query key or keys to remove.
* @param bool|string $query Optional. When false uses the current URL. Default false.
* @return string New URL query string.
*/
function remove_query_arg( $key, $query = false ) {
if ( is_array( $key ) ) { // removing multiple keys
foreach ( $key as $k )
$query = add_query_arg( $k, false, $query );
return $query;
}
return add_query_arg( $key, false, $query );
}

/**
* Returns an array of single-use query variable names that can be removed from a URL.
*
* @since 4.4.0
*
* @return array An array of parameters to remove from the URL.
*/
function wp_removable_query_args() {
$removable_query_args = array(
‘activate’,
‘activated’,
‘approved’,
‘deactivate’,
‘deleted’,
‘disabled’,
‘enabled’,
‘error’,
‘hotkeys_highlight_first’,
‘hotkeys_highlight_last’,
‘locked’,
‘message’,
‘same’,
‘saved’,
‘settings-updated’,
‘skipped’,
‘spammed’,
‘trashed’,
‘unspammed’,
‘untrashed’,
‘update’,
‘updated’,
‘wp-post-new-reload’,
);

/**
* Filters the list of query variables to remove.
*
* @since 4.2.0
*
* @param array $removable_query_args An array of query variables to remove from a URL.
*/
return apply_filters( ‘removable_query_args’, $removable_query_args );
}

/**
* Walks the array while sanitizing the contents.
*
* @since 0.71
*
* @param array $array Array to walk while sanitizing contents.
* @return array Sanitized $array.
*/
function add_magic_quotes( $array ) {
foreach ( (array) $array as $k => $v ) {
if ( is_array( $v ) ) {
$array[$k] = add_magic_quotes( $v );
} else {
$array[$k] = addslashes( $v );
}
}
return $array;
}

/**
* HTTP request for URI to retrieve content.
*
* @since 1.5.1
*
* @see wp_safe_remote_get()
*
* @param string $uri URI/URL of web page to retrieve.
* @return false|string HTTP content. False on failure.
*/
function wp_remote_fopen( $uri ) {
$parsed_url = @parse_url( $uri );

if ( !$parsed_url || !is_array( $parsed_url ) )
return false;

$options = array();
$options[‘timeout’] = 10;

$response = wp_safe_remote_get( $uri, $options );

if ( is_wp_error( $response ) )
return false;

return wp_remote_retrieve_body( $response );
}

/**
* Set up the WordPress query.
*
* @since 2.0.0
*
* @global WP $wp_locale
* @global WP_Query $wp_query
* @global WP_Query $wp_the_query
*
* @param string|array $query_vars Default WP_Query arguments.
*/
function wp( $query_vars = ” ) {
global $wp, $wp_query, $wp_the_query;
$wp->main( $query_vars );

if ( !isset($wp_the_query) )
$wp_the_query = $wp_query;
}

/**
* Retrieve the description for the HTTP status.
*
* @since 2.3.0
*
* @global array $wp_header_to_desc
*
* @param int $code HTTP status code.
* @return string Empty string if not found, or description if found.
*/
function get_status_header_desc( $code ) {
global $wp_header_to_desc;

$code = absint( $code );

if ( !isset( $wp_header_to_desc ) ) {
$wp_header_to_desc = array(
100 => ‘Continue’,
101 => ‘Switching Protocols’,
102 => ‘Processing’,

200 => ‘OK’,
201 => ‘Created’,
202 => ‘Accepted’,
203 => ‘Non-Authoritative Information’,
204 => ‘No Content’,
205 => ‘Reset Content’,
206 => ‘Partial Content’,
207 => ‘Multi-Status’,
226 => ‘IM Used’,

300 => ‘Multiple Choices’,
301 => ‘Moved Permanently’,
302 => ‘Found’,
303 => ‘See Other’,
304 => ‘Not Modified’,
305 => ‘Use Proxy’,
306 => ‘Reserved’,
307 => ‘Temporary Redirect’,
308 => ‘Permanent Redirect’,

400 => ‘Bad Request’,
401 => ‘Unauthorized’,
402 => ‘Payment Required’,
403 => ‘Forbidden’,
404 => ‘Not Found’,
405 => ‘Method Not Allowed’,
406 => ‘Not Acceptable’,
407 => ‘Proxy Authentication Required’,
408 => ‘Request Timeout’,
409 => ‘Conflict’,
410 => ‘Gone’,
411 => ‘Length Required’,
412 => ‘Precondition Failed’,
413 => ‘Request Entity Too Large’,
414 => ‘Request-URI Too Long’,
415 => ‘Unsupported Media Type’,
416 => ‘Requested Range Not Satisfiable’,
417 => ‘Expectation Failed’,
418 => ‘I\’m a teapot’,
421 => ‘Misdirected Request’,
422 => ‘Unprocessable Entity’,
423 => ‘Locked’,
424 => ‘Failed Dependency’,
426 => ‘Upgrade Required’,
428 => ‘Precondition Required’,
429 => ‘Too Many Requests’,
431 => ‘Request Header Fields Too Large’,
451 => ‘Unavailable For Legal Reasons’,

500 => ‘Internal Server Error’,
501 => ‘Not Implemented’,
502 => ‘Bad Gateway’,
503 => ‘Service Unavailable’,
504 => ‘Gateway Timeout’,
505 => ‘HTTP Version Not Supported’,
506 => ‘Variant Also Negotiates’,
507 => ‘Insufficient Storage’,
510 => ‘Not Extended’,
511 => ‘Network Authentication Required’,
);
}

if ( isset( $wp_header_to_desc[$code] ) )
return $wp_header_to_desc[$code];
else
return ”;
}

/**
* Set HTTP status header.
*
* @since 2.0.0
* @since 4.4.0 Added the $description parameter.
*
* @see get_status_header_desc()
*
* @param int $code HTTP status code.
* @param string $description Optional. A custom description for the HTTP status.
*/
function status_header( $code, $description = ” ) {
if ( ! $description ) {
$description = get_status_header_desc( $code );
}

if ( empty( $description ) ) {
return;
}

$protocol = wp_get_server_protocol();
$status_header = “$protocol $code $description”;
if ( function_exists( ‘apply_filters’ ) )

/**
* Filters an HTTP status header.
*
* @since 2.2.0
*
* @param string $status_header HTTP status header.
* @param int $code HTTP status code.
* @param string $description Description for the status code.
* @param string $protocol Server protocol.
*/
$status_header = apply_filters( ‘status_header’, $status_header, $code, $description, $protocol );

@header( $status_header, true, $code );
}

/**
* Get the header information to prevent caching.
*
* The several different headers cover the different ways cache prevention
* is handled by different browsers
*
* @since 2.8.0
*
* @return array The associative array of header names and field values.
*/
function wp_get_nocache_headers() {
$headers = array(
‘Expires’ => ‘Wed, 11 Jan 1984 05:00:00 GMT’,
‘Cache-Control’ => ‘no-cache, must-revalidate, max-age=0’,
);

if ( function_exists(‘apply_filters’) ) {
/**
* Filters the cache-controlling headers.
*
* @since 2.8.0
*
* @see wp_get_nocache_headers()
*
* @param array $headers {
* Header names and field values.
*
* @type string $Expires Expires header.
* @type string $Cache-Control Cache-Control header.
* }
*/
$headers = (array) apply_filters( ‘nocache_headers’, $headers );
}
$headers[‘Last-Modified’] = false;
return $headers;
}

/**
* Set the headers to prevent caching for the different browsers.
*
* Different browsers support different nocache headers, so several
* headers must be sent so that all of them get the point that no
* caching should occur.
*
* @since 2.0.0
*
* @see wp_get_nocache_headers()
*/
function nocache_headers() {
$headers = wp_get_nocache_headers();

unset( $headers[‘Last-Modified’] );

// In PHP 5.3+, make sure we are not sending a Last-Modified header.
if ( function_exists( ‘header_remove’ ) ) {
@header_remove( ‘Last-Modified’ );
} else {
// In PHP 5.2, send an empty Last-Modified header, but only as a
// last resort to override a header already sent. #WP23021
foreach ( headers_list() as $header ) {
if ( 0 === stripos( $header, ‘Last-Modified’ ) ) {
$headers[‘Last-Modified’] = ”;
break;
}
}
}

foreach ( $headers as $name => $field_value )
@header(“{$name}: {$field_value}”);
}

/**
* Set the headers for caching for 10 days with JavaScript content type.
*
* @since 2.1.0
*/
function cache_javascript_headers() {
$expiresOffset = 10 * DAY_IN_SECONDS;

header( “Content-Type: text/javascript; charset=” . get_bloginfo( ‘charset’ ) );
header( “Vary: Accept-Encoding” ); // Handle proxies
header( “Expires: ” . gmdate( “D, d M Y H:i:s”, time() + $expiresOffset ) . ” GMT” );
}

/**
* Retrieve the number of database queries during the WordPress execution.
*
* @since 2.0.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return int Number of database queries.
*/
function get_num_queries() {
global $wpdb;
return $wpdb->num_queries;
}

/**
* Whether input is yes or no.
*
* Must be ‘y’ to be true.
*
* @since 1.0.0
*
* @param string $yn Character string containing either ‘y’ (yes) or ‘n’ (no).
* @return bool True if yes, false on anything else.
*/
function bool_from_yn( $yn ) {
return ( strtolower( $yn ) == ‘y’ );
}

/**
* Load the feed template from the use of an action hook.
*
* If the feed action does not have a hook, then the function will die with a
* message telling the visitor that the feed is not valid.
*
* It is better to only have one hook for each feed.
*
* @since 2.1.0
*
* @global WP_Query $wp_query Used to tell if the use a comment feed.
*/
function do_feed() {
global $wp_query;

$feed = get_query_var( ‘feed’ );

// Remove the pad, if present.
$feed = preg_replace( ‘/^_+/’, ”, $feed );

if ( $feed == ” || $feed == ‘feed’ )
$feed = get_default_feed();

if ( ! has_action( “do_feed_{$feed}” ) ) {
wp_die( __( ‘ERROR: This is not a valid feed template.’ ), ”, array( ‘response’ => 404 ) );
}

/**
* Fires once the given feed is loaded.
*
* The dynamic portion of the hook name, $feed, refers to the feed template name.
* Possible values include: ‘rdf’, ‘rss’, ‘rss2’, and ‘atom’.
*
* @since 2.1.0
* @since 4.4.0 The $feed parameter was added.
*
* @param bool $is_comment_feed Whether the feed is a comment feed.
* @param string $feed The feed name.
*/
do_action( “do_feed_{$feed}”, $wp_query->is_comment_feed, $feed );
}

/**
* Load the RDF RSS 0.91 Feed template.
*
* @since 2.1.0
*
* @see load_template()
*/
function do_feed_rdf() {
load_template( ABSPATH . WPINC . ‘/feed-rdf.php’ );
}

/**
* Load the RSS 1.0 Feed Template.
*
* @since 2.1.0
*
* @see load_template()
*/
function do_feed_rss() {
load_template( ABSPATH . WPINC . ‘/feed-rss.php’ );
}

/**
* Load either the RSS2 comment feed or the RSS2 posts feed.
*
* @since 2.1.0
*
* @see load_template()
*
* @param bool $for_comments True for the comment feed, false for normal feed.
*/
function do_feed_rss2( $for_comments ) {
if ( $for_comments )
load_template( ABSPATH . WPINC . ‘/feed-rss2-comments.php’ );
else
load_template( ABSPATH . WPINC . ‘/feed-rss2.php’ );
}

/**
* Load either Atom comment feed or Atom posts feed.
*
* @since 2.1.0
*
* @see load_template()
*
* @param bool $for_comments True for the comment feed, false for normal feed.
*/
function do_feed_atom( $for_comments ) {
if ($for_comments)
load_template( ABSPATH . WPINC . ‘/feed-atom-comments.php’);
else
load_template( ABSPATH . WPINC . ‘/feed-atom.php’ );
}

/**
* Display the robots.txt file content.
*
* The echo content should be with usage of the permalinks or for creating the
* robots.txt file.
*
* @since 2.1.0
*/
function do_robots() {
header( ‘Content-Type: text/plain; charset=utf-8’ );

/**
* Fires when displaying the robots.txt file.
*
* @since 2.1.0
*/
do_action( ‘do_robotstxt’ );

$output = “User-agent: *\n”;
$public = get_option( ‘blog_public’ );
if ( ‘0’ == $public ) {
$output .= “Disallow: /\n”;
} else {
$site_url = parse_url( site_url() );
$path = ( !empty( $site_url[‘path’] ) ) ? $site_url[‘path’] : ”;
$output .= “Disallow: $path/wp-admin/\n”;
$output .= “Allow: $path/wp-admin/admin-ajax.php\n”;
}

/**
* Filters the robots.txt output.
*
* @since 3.0.0
*
* @param string $output Robots.txt output.
* @param bool $public Whether the site is considered “public”.
*/
echo apply_filters( ‘robots_txt’, $output, $public );
}

/**
* Test whether WordPress is already installed.
*
* The cache will be checked first. If you have a cache plugin, which saves
* the cache values, then this will work. If you use the default WordPress
* cache, and the database goes away, then you might have problems.
*
* Checks for the ‘siteurl’ option for whether WordPress is installed.
*
* @since 2.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return bool Whether the site is already installed.
*/
function is_blog_installed() {
global $wpdb;

/*
* Check cache first. If options table goes away and we have true
* cached, oh well.
*/
if ( wp_cache_get( ‘is_blog_installed’ ) )
return true;

$suppress = $wpdb->suppress_errors();
if ( ! wp_installing() ) {
$alloptions = wp_load_alloptions();
}
// If siteurl is not set to autoload, check it specifically
if ( !isset( $alloptions[‘siteurl’] ) )
$installed = $wpdb->get_var( “SELECT option_value FROM $wpdb->options WHERE option_name = ‘siteurl'” );
else
$installed = $alloptions[‘siteurl’];
$wpdb->suppress_errors( $suppress );

$installed = !empty( $installed );
wp_cache_set( ‘is_blog_installed’, $installed );

if ( $installed )
return true;

// If visiting repair.php, return true and let it take over.
if ( defined( ‘WP_REPAIRING’ ) )
return true;

$suppress = $wpdb->suppress_errors();

/*
* Loop over the WP tables. If none exist, then scratch install is allowed.
* If one or more exist, suggest table repair since we got here because the
* options table could not be accessed.
*/
$wp_tables = $wpdb->tables();
foreach ( $wp_tables as $table ) {
// The existence of custom user tables shouldn’t suggest an insane state or prevent a clean install.
if ( defined( ‘CUSTOM_USER_TABLE’ ) && CUSTOM_USER_TABLE == $table )
continue;
if ( defined( ‘CUSTOM_USER_META_TABLE’ ) && CUSTOM_USER_META_TABLE == $table )
continue;

if ( ! $wpdb->get_results( “DESCRIBE $table;” ) )
continue;

// One or more tables exist. We are insane.

wp_load_translations_early();

// Die with a DB error.
$wpdb->error = sprintf( __( ‘One or more database tables are unavailable. The database may need to be <a href=”%s”>repaired</a>.’ ), ‘maint/repair.php?referrer=is_blog_installed’ );
dead_db();
}

$wpdb->suppress_errors( $suppress );

wp_cache_set( ‘is_blog_installed’, false );

return false;
}

/**
* Retrieve URL with nonce added to URL query.
*
* @since 2.0.4
*
* @param string $actionurl URL to add nonce action.
* @param int|string $action Optional. Nonce action name. Default -1.
* @param string $name Optional. Nonce name. Default ‘_wpnonce’.
* @return string Escaped URL with nonce action added.
*/
function wp_nonce_url( $actionurl, $action = -1, $name = ‘_wpnonce’ ) {
$actionurl = str_replace( ‘&’, ‘&’, $actionurl );
return esc_html( add_query_arg( $name, wp_create_nonce( $action ), $actionurl ) );
}

/**
* Retrieve or display nonce hidden field for forms.
*
* The nonce field is used to validate that the contents of the form came from
* the location on the current site and not somewhere else. The nonce does not
* offer absolute protection, but should protect against most cases. It is very
* important to use nonce field in forms.
*
* The $action and $name are optional, but if you want to have better security,
* it is strongly suggested to set those two parameters. It is easier to just
* call the function without any parameters, because validation of the nonce
* doesn’t require any parameters, but since crackers know what the default is
* it won’t be difficult for them to find a way around your nonce and cause
* damage.
*
* The input name will be whatever $name value you gave. The input value will be
* the nonce creation value.
*
* @since 2.0.4
*
* @param int|string $action Optional. Action name. Default -1.
* @param string $name Optional. Nonce name. Default ‘_wpnonce’.
* @param bool $referer Optional. Whether to set the referer field for validation. Default true.
* @param bool $echo Optional. Whether to display or return hidden form field. Default true.
* @return string Nonce field HTML markup.
*/
function wp_nonce_field( $action = -1, $name = “_wpnonce”, $referer = true , $echo = true ) {
$name = esc_attr( $name );
$nonce_field = ‘<input type=”hidden” id=”‘ . $name . ‘” name=”‘ . $name . ‘” value=”‘ . wp_create_nonce( $action ) . ‘” />’;

if ( $referer )
$nonce_field .= wp_referer_field( false );

if ( $echo )
echo $nonce_field;

return $nonce_field;
}

/**
* Retrieve or display referer hidden field for forms.
*
* The referer link is the current Request URI from the server super global. The
* input name is ‘_wp_http_referer’, in case you wanted to check manually.
*
* @since 2.0.4
*
* @param bool $echo Optional. Whether to echo or return the referer field. Default true.
* @return string Referer field HTML markup.
*/
function wp_referer_field( $echo = true ) {
$referer_field = ‘<input type=”hidden” name=”_wp_http_referer” value=”‘. esc_attr( wp_unslash( $_SERVER[‘REQUEST_URI’] ) ) . ‘” />’;

if ( $echo )
echo $referer_field;
return $referer_field;
}

/**
* Retrieve or display original referer hidden field for forms.
*
* The input name is ‘_wp_original_http_referer’ and will be either the same
* value of wp_referer_field(), if that was posted already or it will be the
* current page, if it doesn’t exist.
*
* @since 2.0.4
*
* @param bool $echo Optional. Whether to echo the original http referer. Default true.
* @param string $jump_back_to Optional. Can be ‘previous’ or page you want to jump back to.
* Default ‘current’.
* @return string Original referer field.
*/
function wp_original_referer_field( $echo = true, $jump_back_to = ‘current’ ) {
if ( ! $ref = wp_get_original_referer() ) {
$ref = ‘previous’ == $jump_back_to ? wp_get_referer() : wp_unslash( $_SERVER[‘REQUEST_URI’] );
}
$orig_referer_field = ‘<input type=”hidden” name=”_wp_original_http_referer” value=”‘ . esc_attr( $ref ) . ‘” />’;
if ( $echo )
echo $orig_referer_field;
return $orig_referer_field;
}

/**
* Retrieve referer from ‘_wp_http_referer’ or HTTP referer.
*
* If it’s the same as the current request URL, will return false.
*
* @since 2.0.4
*
* @return false|string False on failure. Referer URL on success.
*/
function wp_get_referer() {
if ( ! function_exists( ‘wp_validate_redirect’ ) ) {
return false;
}

$ref = wp_get_raw_referer();

if ( $ref && $ref !== wp_unslash( $_SERVER[‘REQUEST_URI’] ) && $ref !== home_url() . wp_unslash( $_SERVER[‘REQUEST_URI’] ) ) {
return wp_validate_redirect( $ref, false );
}

return false;
}

/**
* Retrieves unvalidated referer from ‘_wp_http_referer’ or HTTP referer.
*
* Do not use for redirects, use wp_get_referer() instead.
*
* @since 4.5.0
*
* @return string|false Referer URL on success, false on failure.
*/
function wp_get_raw_referer() {
if ( ! empty( $_REQUEST[‘_wp_http_referer’] ) ) {
return wp_unslash( $_REQUEST[‘_wp_http_referer’] );
} else if ( ! empty( $_SERVER[‘HTTP_REFERER’] ) ) {
return wp_unslash( $_SERVER[‘HTTP_REFERER’] );
}

return false;
}

/**
* Retrieve original referer that was posted, if it exists.
*
* @since 2.0.4
*
* @return string|false False if no original referer or original referer if set.
*/
function wp_get_original_referer() {
if ( ! empty( $_REQUEST[‘_wp_original_http_referer’] ) && function_exists( ‘wp_validate_redirect’ ) )
return wp_validate_redirect( wp_unslash( $_REQUEST[‘_wp_original_http_referer’] ), false );
return false;
}

/**
* Recursive directory creation based on full path.
*
* Will attempt to set permissions on folders.
*
* @since 2.0.1
*
* @param string $target Full path to attempt to create.
* @return bool Whether the path was created. True if path already exists.
*/
function wp_mkdir_p( $target ) {
$wrapper = null;

// Strip the protocol.
if ( wp_is_stream( $target ) ) {
list( $wrapper, $target ) = explode( ‘://’, $target, 2 );
}

// From php.net/mkdir user contributed notes.
$target = str_replace( ‘//’, ‘/’, $target );

// Put the wrapper back on the target.
if ( $wrapper !== null ) {
$target = $wrapper . ‘://’ . $target;
}

/*
* Safe mode fails with a trailing slash under certain PHP versions.
* Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
*/
$target = rtrim($target, ‘/’);
if ( empty($target) )
$target = ‘/’;

if ( file_exists( $target ) )
return @is_dir( $target );

// We need to find the permissions of the parent folder that exists and inherit that.
$target_parent = dirname( $target );
while ( ‘.’ != $target_parent && ! is_dir( $target_parent ) ) {
$target_parent = dirname( $target_parent );
}

// Get the permission bits.
if ( $stat = @stat( $target_parent ) ) {
$dir_perms = $stat[‘mode’] & 0007777;
} else {
$dir_perms = 0777;
}

if ( @mkdir( $target, $dir_perms, true ) ) {

/*
* If a umask is set that modifies $dir_perms, we’ll have to re-set
* the $dir_perms correctly with chmod()
*/
if ( $dir_perms != ( $dir_perms & ~umask() ) ) {
$folder_parts = explode( ‘/’, substr( $target, strlen( $target_parent ) + 1 ) );
for ( $i = 1, $c = count( $folder_parts ); $i <= $c; $i++ ) {
@chmod( $target_parent . ‘/’ . implode( ‘/’, array_slice( $folder_parts, 0, $i ) ), $dir_perms );
}
}

return true;
}

return false;
}

/**
* Test if a give filesystem path is absolute.
*
* For example, ‘/foo/bar’, or ‘c:\windows’.
*
* @since 2.5.0
*
* @param string $path File path.
* @return bool True if path is absolute, false is not absolute.
*/
function path_is_absolute( $path ) {
/*
* This is definitive if true but fails if $path does not exist or contains
* a symbolic link.
*/
if ( realpath($path) == $path )
return true;

if ( strlen($path) == 0 || $path[0] == ‘.’ )
return false;

// Windows allows absolute paths like this.
if ( preg_match(‘#^[a-zA-Z]:\\\\#’, $path) )
return true;

// A path starting with / or \ is absolute; anything else is relative.
return ( $path[0] == ‘/’ || $path[0] == ‘\\’ );
}

/**
* Join two filesystem paths together.
*
* For example, ‘give me $path relative to $base’. If the $path is absolute,
* then it the full path is returned.
*
* @since 2.5.0
*
* @param string $base Base path.
* @param string $path Path relative to $base.
* @return string The path with the base or absolute path.
*/
function path_join( $base, $path ) {
if ( path_is_absolute($path) )
return $path;

return rtrim($base, ‘/’) . ‘/’ . ltrim($path, ‘/’);
}

/**
* Normalize a filesystem path.
*
* On windows systems, replaces backslashes with forward slashes
* and forces upper-case drive letters.
* Allows for two leading slashes for Windows network shares, but
* ensures that all other duplicate slashes are reduced to a single.
*
* @since 3.9.0
* @since 4.4.0 Ensures upper-case drive letters on Windows systems.
* @since 4.5.0 Allows for Windows network shares.
*
* @param string $path Path to normalize.
* @return string Normalized path.
*/
function wp_normalize_path( $path ) {
$path = str_replace( ‘\\’, ‘/’, $path );
$path = preg_replace( ‘|(?<=.)/+|’, ‘/’, $path );
if ( ‘:’ === substr( $path, 1, 1 ) ) {
$path = ucfirst( $path );
}
return $path;
}

/**
* Determine a writable directory for temporary files.
*
* Function’s preference is the return value of sys_get_temp_dir(),
* followed by your PHP temporary upload directory, followed by WP_CONTENT_DIR,
* before finally defaulting to /tmp/
*
* In the event that this function does not find a writable location,
* It may be overridden by the WP_TEMP_DIR constant in your wp-config.php file.
*
* @since 2.5.0
*
* @staticvar string $temp
*
* @return string Writable temporary directory.
*/
function get_temp_dir() {
static $temp = ”;
if ( defined(‘WP_TEMP_DIR’) )
return trailingslashit(WP_TEMP_DIR);

if ( $temp )
return trailingslashit( $temp );

if ( function_exists(‘sys_get_temp_dir’) ) {
$temp = sys_get_temp_dir();
if ( @is_dir( $temp ) && wp_is_writable( $temp ) )
return trailingslashit( $temp );
}

$temp = ini_get(‘upload_tmp_dir’);
if ( @is_dir( $temp ) && wp_is_writable( $temp ) )
return trailingslashit( $temp );

$temp = WP_CONTENT_DIR . ‘/’;
if ( is_dir( $temp ) && wp_is_writable( $temp ) )
return $temp;

return ‘/tmp/’;
}

/**
* Determine if a directory is writable.
*
* This function is used to work around certain ACL issues in PHP primarily
* affecting Windows Servers.
*
* @since 3.6.0
*
* @see win_is_writable()
*
* @param string $path Path to check for write-ability.
* @return bool Whether the path is writable.
*/
function wp_is_writable( $path ) {
if ( ‘WIN’ === strtoupper( substr( PHP_OS, 0, 3 ) ) )
return win_is_writable( $path );
else
return @is_writable( $path );
}

/**
* Workaround for Windows bug in is_writable() function
*
* PHP has issues with Windows ACL’s for determine if a
* directory is writable or not, this works around them by
* checking the ability to open files rather than relying
* upon PHP to interprate the OS ACL.
*
* @since 2.8.0
*
* @see https://bugs.php.net/bug.php?id=27609
* @see https://bugs.php.net/bug.php?id=30931
*
* @param string $path Windows path to check for write-ability.
* @return bool Whether the path is writable.
*/
function win_is_writable( $path ) {

if ( $path[strlen( $path ) – 1] == ‘/’ ) { // if it looks like a directory, check a random file within the directory
return win_is_writable( $path . uniqid( mt_rand() ) . ‘.tmp’);
} elseif ( is_dir( $path ) ) { // If it’s a directory (and not a file) check a random file within the directory
return win_is_writable( $path . ‘/’ . uniqid( mt_rand() ) . ‘.tmp’ );
}
// check tmp file for read/write capabilities
$should_delete_tmp_file = !file_exists( $path );
$f = @fopen( $path, ‘a’ );
if ( $f === false )
return false;
fclose( $f );
if ( $should_delete_tmp_file )
unlink( $path );
return true;
}

/**
* Retrieves uploads directory information.
*
* Same as wp_upload_dir() but “light weight” as it doesn’t attempt to create the uploads directory.
* Intended for use in themes, when only ‘basedir’ and ‘baseurl’ are needed, generally in all cases
* when not uploading files.
*
* @since 4.5.0
*
* @see wp_upload_dir()
*
* @return array See wp_upload_dir() for description.
*/
function wp_get_upload_dir() {
return wp_upload_dir( null, false );
}

/**
* Get an array containing the current upload directory’s path and url.
*
* Checks the ‘upload_path’ option, which should be from the web root folder,
* and if it isn’t empty it will be used. If it is empty, then the path will be
* ‘WP_CONTENT_DIR/uploads’. If the ‘UPLOADS’ constant is defined, then it will
* override the ‘upload_path’ option and ‘WP_CONTENT_DIR/uploads’ path.
*
* The upload URL path is set either by the ‘upload_url_path’ option or by using
* the ‘WP_CONTENT_URL’ constant and appending ‘/uploads’ to the path.
*
* If the ‘uploads_use_yearmonth_folders’ is set to true (checkbox if checked in
* the administration settings panel), then the time will be used. The format
* will be year first and then month.
*
* If the path couldn’t be created, then an error will be returned with the key
* ‘error’ containing the error message. The error suggests that the parent
* directory is not writable by the server.
*
* On success, the returned array will have many indices:
* ‘path’ – base directory and sub directory or full path to upload directory.
* ‘url’ – base url and sub directory or absolute URL to upload directory.
* ‘subdir’ – sub directory if uploads use year/month folders option is on.
* ‘basedir’ – path without subdir.
* ‘baseurl’ – URL path without subdir.
* ‘error’ – false or error message.
*
* @since 2.0.0
* @uses _wp_upload_dir()
*
* @param string $time Optional. Time formatted in ‘yyyy/mm’. Default null.
* @param bool $create_dir Optional. Whether to check and create the uploads directory.
* Default true for backward compatibility.
* @param bool $refresh_cache Optional. Whether to refresh the cache. Default false.
* @return array See above for description.
*/
function wp_upload_dir( $time = null, $create_dir = true, $refresh_cache = false ) {
static $cache = array(), $tested_paths = array();

$key = sprintf( ‘%d-%s’, get_current_blog_id(), (string) $time );

if ( $refresh_cache || empty( $cache[ $key ] ) ) {
$cache[ $key ] = _wp_upload_dir( $time );
}

/**
* Filters the uploads directory data.
*
* @since 2.0.0
*
* @param array $uploads Array of upload directory data with keys of ‘path’,
* ‘url’, ‘subdir, ‘basedir’, and ‘error’.
*/
$uploads = apply_filters( ‘upload_dir’, $cache[ $key ] );

if ( $create_dir ) {
$path = $uploads[‘path’];

if ( array_key_exists( $path, $tested_paths ) ) {
$uploads[‘error’] = $tested_paths[ $path ];
} else {
if ( ! wp_mkdir_p( $path ) ) {
if ( 0 === strpos( $uploads[‘basedir’], ABSPATH ) ) {
$error_path = str_replace( ABSPATH, ”, $uploads[‘basedir’] ) . $uploads[‘subdir’];
} else {
$error_path = basename( $uploads[‘basedir’] ) . $uploads[‘subdir’];
}

$uploads[‘error’] = sprintf( __( ‘Unable to create directory %s. Is its parent directory writable by the server?’ ), esc_html( $error_path ) );
}

$tested_paths[ $path ] = $uploads[‘error’];
}
}

return $uploads;
}

/**
* A non-filtered, non-cached version of wp_upload_dir() that doesn’t check the path.
*
* @access private
*
* @param string $time Optional. Time formatted in ‘yyyy/mm’. Default null.
* @return array See wp_upload_dir()
*/
function _wp_upload_dir( $time = null ) {
$siteurl = get_option( ‘siteurl’ );
$upload_path = trim( get_option( ‘upload_path’ ) );

if ( empty( $upload_path ) || ‘wp-content/uploads’ == $upload_path ) {
$dir = WP_CONTENT_DIR . ‘/uploads’;
} elseif ( 0 !== strpos( $upload_path, ABSPATH ) ) {
// $dir is absolute, $upload_path is (maybe) relative to ABSPATH
$dir = path_join( ABSPATH, $upload_path );
} else {
$dir = $upload_path;
}

if ( !$url = get_option( ‘upload_url_path’ ) ) {
if ( empty($upload_path) || ( ‘wp-content/uploads’ == $upload_path ) || ( $upload_path == $dir ) )
$url = WP_CONTENT_URL . ‘/uploads’;
else
$url = trailingslashit( $siteurl ) . $upload_path;
}

/*
* Honor the value of UPLOADS. This happens as long as ms-files rewriting is disabled.
* We also sometimes obey UPLOADS when rewriting is enabled — see the next block.
*/
if ( defined( ‘UPLOADS’ ) && ! ( is_multisite() && get_site_option( ‘ms_files_rewriting’ ) ) ) {
$dir = ABSPATH . UPLOADS;
$url = trailingslashit( $siteurl ) . UPLOADS;
}

// If multisite (and if not the main site in a post-MU network)
if ( is_multisite() && ! ( is_main_network() && is_main_site() && defined( ‘MULTISITE’ ) ) ) {

if ( ! get_site_option( ‘ms_files_rewriting’ ) ) {
/*
* If ms-files rewriting is disabled (networks created post-3.5), it is fairly
* straightforward: Append sites/%d if we’re not on the main site (for post-MU
* networks). (The extra directory prevents a four-digit ID from conflicting with
* a year-based directory for the main site. But if a MU-era network has disabled
* ms-files rewriting manually, they don’t need the extra directory, as they never
* had wp-content/uploads for the main site.)
*/

if ( defined( ‘MULTISITE’ ) )
$ms_dir = ‘/sites/’ . get_current_blog_id();
else
$ms_dir = ‘/’ . get_current_blog_id();

$dir .= $ms_dir;
$url .= $ms_dir;

} elseif ( defined( ‘UPLOADS’ ) && ! ms_is_switched() ) {
/*
* Handle the old-form ms-files.php rewriting if the network still has that enabled.
* When ms-files rewriting is enabled, then we only listen to UPLOADS when:
* 1) We are not on the main site in a post-MU network, as wp-content/uploads is used
* there, and
* 2) We are not switched, as ms_upload_constants() hardcodes these constants to reflect
* the original blog ID.
*
* Rather than UPLOADS, we actually use BLOGUPLOADDIR if it is set, as it is absolute.
* (And it will be set, see ms_upload_constants().) Otherwise, UPLOADS can be used, as
* as it is relative to ABSPATH. For the final piece: when UPLOADS is used with ms-files
* rewriting in multisite, the resulting URL is /files. (#WP22702 for background.)
*/

if ( defined( ‘BLOGUPLOADDIR’ ) )
$dir = untrailingslashit( BLOGUPLOADDIR );
else
$dir = ABSPATH . UPLOADS;
$url = trailingslashit( $siteurl ) . ‘files’;
}
}

$basedir = $dir;
$baseurl = $url;

$subdir = ”;
if ( get_option( ‘uploads_use_yearmonth_folders’ ) ) {
// Generate the yearly and monthly dirs
if ( !$time )
$time = current_time( ‘mysql’ );
$y = substr( $time, 0, 4 );
$m = substr( $time, 5, 2 );
$subdir = “/$y/$m”;
}

$dir .= $subdir;
$url .= $subdir;

return array(
‘path’ => $dir,
‘url’ => $url,
‘subdir’ => $subdir,
‘basedir’ => $basedir,
‘baseurl’ => $baseurl,
‘error’ => false,
);
}

/**
* Get a filename that is sanitized and unique for the given directory.
*
* If the filename is not unique, then a number will be added to the filename
* before the extension, and will continue adding numbers until the filename is
* unique.
*
* The callback is passed three parameters, the first one is the directory, the
* second is the filename, and the third is the extension.
*
* @since 2.5.0
*
* @param string $dir Directory.
* @param string $filename File name.
* @param callable $unique_filename_callback Callback. Default null.
* @return string New filename, if given wasn’t unique.
*/
function wp_unique_filename( $dir, $filename, $unique_filename_callback = null ) {
// Sanitize the file name before we begin processing.
$filename = sanitize_file_name($filename);

// Separate the filename into a name and extension.
$info = pathinfo($filename);
$ext = !empty($info[‘extension’]) ? ‘.’ . $info[‘extension’] : ”;
$name = basename($filename, $ext);

// Edge case: if file is named ‘.ext’, treat as an empty name.
if ( $name === $ext )
$name = ”;

/*
* Increment the file number until we have a unique file to save in $dir.
* Use callback if supplied.
*/
if ( $unique_filename_callback && is_callable( $unique_filename_callback ) ) {
$filename = call_user_func( $unique_filename_callback, $dir, $name, $ext );
} else {
$number = ”;

// Change ‘.ext’ to lower case.
if ( $ext && strtolower($ext) != $ext ) {
$ext2 = strtolower($ext);
$filename2 = preg_replace( ‘|’ . preg_quote($ext) . ‘$|’, $ext2, $filename );

// Check for both lower and upper case extension or image sub-sizes may be overwritten.
while ( file_exists($dir . “/$filename”) || file_exists($dir . “/$filename2”) ) {
$new_number = $number + 1;
$filename = str_replace( array( “-$number$ext”, “$number$ext” ), “-$new_number$ext”, $filename );
$filename2 = str_replace( array( “-$number$ext2”, “$number$ext2” ), “-$new_number$ext2”, $filename2 );
$number = $new_number;
}

/**
* Filters the result when generating a unique file name.
*
* @since 4.5.0
*
* @param string $filename Unique file name.
* @param string $ext File extension, eg. “.png”.
* @param string $dir Directory path.
* @param callable|null $unique_filename_callback Callback function that generates the unique file name.
*/
return apply_filters( ‘wp_unique_filename’, $filename2, $ext, $dir, $unique_filename_callback );
}

while ( file_exists( $dir . “/$filename” ) ) {
if ( ” == “$number$ext” ) {
$filename = “$filename-” . ++$number;
} else {
$filename = str_replace( array( “-$number$ext”, “$number$ext” ), “-” . ++$number . $ext, $filename );
}
}
}

/** This filter is documented in wp-includes/functions.php */
return apply_filters( ‘wp_unique_filename’, $filename, $ext, $dir, $unique_filename_callback );
}

/**
* Create a file in the upload folder with given content.
*
* If there is an error, then the key ‘error’ will exist with the error message.
* If success, then the key ‘file’ will have the unique file path, the ‘url’ key
* will have the link to the new file. and the ‘error’ key will be set to false.
*
* This function will not move an uploaded file to the upload folder. It will
* create a new file with the content in $bits parameter. If you move the upload
* file, read the content of the uploaded file, and then you can give the
* filename and content to this function, which will add it to the upload
* folder.
*
* The permissions will be set on the new file automatically by this function.
*
* @since 2.0.0
*
* @param string $name Filename.
* @param null|string $deprecated Never used. Set to null.
* @param mixed $bits File content
* @param string $time Optional. Time formatted in ‘yyyy/mm’. Default null.
* @return array
*/
function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
if ( !empty( $deprecated ) )
_deprecated_argument( __FUNCTION__, ‘2.0.0’ );

if ( empty( $name ) )
return array( ‘error’ => __( ‘Empty filename’ ) );

$wp_filetype = wp_check_filetype( $name );
if ( ! $wp_filetype[‘ext’] && ! current_user_can( ‘unfiltered_upload’ ) )
return array( ‘error’ => __( ‘Invalid file type’ ) );

$upload = wp_upload_dir( $time );

if ( $upload[‘error’] !== false )
return $upload;

/**
* Filters whether to treat the upload bits as an error.
*
* Passing a non-array to the filter will effectively short-circuit preparing
* the upload bits, returning that value instead.
*
* @since 3.0.0
*
* @param mixed $upload_bits_error An array of upload bits data, or a non-array error to return.
*/
$upload_bits_error = apply_filters( ‘wp_upload_bits’, array( ‘name’ => $name, ‘bits’ => $bits, ‘time’ => $time ) );
if ( !is_array( $upload_bits_error ) ) {
$upload[ ‘error’ ] = $upload_bits_error;
return $upload;
}

$filename = wp_unique_filename( $upload[‘path’], $name );

$new_file = $upload[‘path’] . “/$filename”;
if ( ! wp_mkdir_p( dirname( $new_file ) ) ) {
if ( 0 === strpos( $upload[‘basedir’], ABSPATH ) )
$error_path = str_replace( ABSPATH, ”, $upload[‘basedir’] ) . $upload[‘subdir’];
else
$error_path = basename( $upload[‘basedir’] ) . $upload[‘subdir’];

$message = sprintf( __( ‘Unable to create directory %s. Is its parent directory writable by the server?’ ), $error_path );
return array( ‘error’ => $message );
}

$ifp = @ fopen( $new_file, ‘wb’ );
if ( ! $ifp )
return array( ‘error’ => sprintf( __( ‘Could not write file %s’ ), $new_file ) );

@fwrite( $ifp, $bits );
fclose( $ifp );
clearstatcache();

// Set correct file permissions
$stat = @ stat( dirname( $new_file ) );
$perms = $stat[‘mode’] & 0007777;
$perms = $perms & 0000666;
@ chmod( $new_file, $perms );
clearstatcache();

// Compute the URL
$url = $upload[‘url’] . “/$filename”;

/** This filter is documented in wp-admin/includes/file.php */
return apply_filters( ‘wp_handle_upload’, array( ‘file’ => $new_file, ‘url’ => $url, ‘type’ => $wp_filetype[‘type’], ‘error’ => false ), ‘sideload’ );
}

/**
* Retrieve the file type based on the extension name.
*
* @since 2.5.0
*
* @param string $ext The extension to search.
* @return string|void The file type, example: audio, video, document, spreadsheet, etc.
*/
function wp_ext2type( $ext ) {
$ext = strtolower( $ext );

$ext2type = wp_get_ext_types();
foreach ( $ext2type as $type => $exts )
if ( in_array( $ext, $exts ) )
return $type;
}

/**
* Retrieve the file type from the file name.
*
* You can optionally define the mime array, if needed.
*
* @since 2.0.4
*
* @param string $filename File name or path.
* @param array $mimes Optional. Key is the file extension with value as the mime type.
* @return array Values with extension first and mime type.
*/
function wp_check_filetype( $filename, $mimes = null ) {
if ( empty($mimes) )
$mimes = get_allowed_mime_types();
$type = false;
$ext = false;

foreach ( $mimes as $ext_preg => $mime_match ) {
$ext_preg = ‘!\.(‘ . $ext_preg . ‘)$!i’;
if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
$type = $mime_match;
$ext = $ext_matches[1];
break;
}
}

return compact( ‘ext’, ‘type’ );
}

/**
* Attempt to determine the real file type of a file.
*
* If unable to, the file name extension will be used to determine type.
*
* If it’s determined that the extension does not match the file’s real type,
* then the “proper_filename” value will be set with a proper filename and extension.
*
* Currently this function only supports renaming images validated via wp_get_image_mime().
*
* @since 3.0.0
*
* @param string $file Full path to the file.
* @param string $filename The name of the file (may differ from $file due to $file being
* in a tmp directory).
* @param array $mimes Optional. Key is the file extension with value as the mime type.
* @return array Values for the extension, MIME, and either a corrected filename or false
* if original $filename is valid.
*/
function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
$proper_filename = false;

// Do basic extension validation and MIME mapping
$wp_filetype = wp_check_filetype( $filename, $mimes );
$ext = $wp_filetype[‘ext’];
$type = $wp_filetype[‘type’];

// We can’t do any further validation without a file to work with
if ( ! file_exists( $file ) ) {
return compact( ‘ext’, ‘type’, ‘proper_filename’ );
}

// Validate image types.
if ( $type && 0 === strpos( $type, ‘image/’ ) ) {

// Attempt to figure out what type of image it actually is
$real_mime = wp_get_image_mime( $file );

if ( ! $real_mime ) {
$type = $ext = false;
} elseif ( $real_mime != $type ) {
/**
* Filters the list mapping image mime types to their respective extensions.
*
* @since 3.0.0
*
* @param array $mime_to_ext Array of image mime types and their matching extensions.
*/
$mime_to_ext = apply_filters( ‘getimagesize_mimes_to_exts’, array(
‘image/jpeg’ => ‘jpg’,
‘image/png’ => ‘png’,
‘image/gif’ => ‘gif’,
‘image/bmp’ => ‘bmp’,
‘image/tiff’ => ‘tif’,
) );

// Replace whatever is after the last period in the filename with the correct extension
if ( ! empty( $mime_to_ext[ $real_mime ] ) ) {
$filename_parts = explode( ‘.’, $filename );
array_pop( $filename_parts );
$filename_parts[] = $mime_to_ext[ $real_mime ];
$new_filename = implode( ‘.’, $filename_parts );

if ( $new_filename != $filename ) {
$proper_filename = $new_filename; // Mark that it changed
}
// Redefine the extension / MIME
$wp_filetype = wp_check_filetype( $new_filename, $mimes );
$ext = $wp_filetype[‘ext’];
$type = $wp_filetype[‘type’];
} else {
$type = $ext = false;
}
}
} elseif ( function_exists( ‘finfo_file’ ) ) {
// Use finfo_file if available to validate non-image files.
$finfo = finfo_open( FILEINFO_MIME_TYPE );
$real_mime = finfo_file( $finfo, $file );
finfo_close( $finfo );

// If the extension does not match the file’s real type, return false.
if ( $real_mime !== $type ) {
$type = $ext = false;
}
}

/**
* Filters the “real” file type of the given file.
*
* @since 3.0.0
*
* @param array $wp_check_filetype_and_ext File data array containing ‘ext’, ‘type’, and
* ‘proper_filename’ keys.
* @param string $file Full path to the file.
* @param string $filename The name of the file (may differ from $file due to
* $file being in a tmp directory).
* @param array $mimes Key is the file extension with value as the mime type.
*/
return apply_filters( ‘wp_check_filetype_and_ext’, compact( ‘ext’, ‘type’, ‘proper_filename’ ), $file, $filename, $mimes );
}

/**
* Returns the real mime type of an image file.
*
* This depends on exif_imagetype() or getimagesize() to determine real mime types.
*
* @since 4.7.1
*
* @param string $file Full path to the file.
* @return string|false The actual mime type or false if the type cannot be determined.
*/
function wp_get_image_mime( $file ) {
/*
* Use exif_imagetype() to check the mimetype if available or fall back to
* getimagesize() if exif isn’t avaialbe. If either function throws an Exception
* we assume the file could not be validated.
*/
try {
if ( is_callable( ‘exif_imagetype’ ) ) {
$mime = image_type_to_mime_type( exif_imagetype( $file ) );
} elseif ( function_exists( ‘getimagesize’ ) ) {
$imagesize = getimagesize( $file );
$mime = ( isset( $imagesize[‘mime’] ) ) ? $imagesize[‘mime’] : false;
} else {
$mime = false;
}
} catch ( Exception $e ) {
$mime = false;
}

return $mime;
}

/**
* Retrieve list of mime types and file extensions.
*
* @since 3.5.0
* @since 4.2.0 Support was added for GIMP (xcf) files.
*
* @return array Array of mime types keyed by the file extension regex corresponding to those types.
*/
function wp_get_mime_types() {
/**
* Filters the list of mime types and file extensions.
*
* This filter should be used to add, not remove, mime types. To remove
* mime types, use the {@see ‘upload_mimes’} filter.
*
* @since 3.5.0
*
* @param array $wp_get_mime_types Mime types keyed by the file extension regex
* corresponding to those types.
*/
return apply_filters( ‘mime_types’, array(
// Image formats.
‘jpg|jpeg|jpe’ => ‘image/jpeg’,
‘gif’ => ‘image/gif’,
‘png’ => ‘image/png’,
‘bmp’ => ‘image/bmp’,
‘tiff|tif’ => ‘image/tiff’,
‘ico’ => ‘image/x-icon’,
// Video formats.
‘asf|asx’ => ‘video/x-ms-asf’,
‘wmv’ => ‘video/x-ms-wmv’,
‘wmx’ => ‘video/x-ms-wmx’,
‘wm’ => ‘video/x-ms-wm’,
‘avi’ => ‘video/avi’,
‘divx’ => ‘video/divx’,
‘flv’ => ‘video/x-flv’,
‘mov|qt’ => ‘video/quicktime’,
‘mpeg|mpg|mpe’ => ‘video/mpeg’,
‘mp4|m4v’ => ‘video/mp4’,
‘ogv’ => ‘video/ogg’,
‘webm’ => ‘video/webm’,
‘mkv’ => ‘video/x-matroska’,
‘3gp|3gpp’ => ‘video/3gpp’, // Can also be audio
‘3g2|3gp2’ => ‘video/3gpp2’, // Can also be audio
// Text formats.
‘txt|asc|c|cc|h|srt’ => ‘text/plain’,
‘csv’ => ‘text/csv’,
‘tsv’ => ‘text/tab-separated-values’,
‘ics’ => ‘text/calendar’,
‘rtx’ => ‘text/richtext’,
‘css’ => ‘text/css’,
‘htm|html’ => ‘text/html’,
‘vtt’ => ‘text/vtt’,
‘dfxp’ => ‘application/ttaf+xml’,
// Audio formats.
‘mp3|m4a|m4b’ => ‘audio/mpeg’,
‘ra|ram’ => ‘audio/x-realaudio’,
‘wav’ => ‘audio/wav’,
‘ogg|oga’ => ‘audio/ogg’,
‘mid|midi’ => ‘audio/midi’,
‘wma’ => ‘audio/x-ms-wma’,
‘wax’ => ‘audio/x-ms-wax’,
‘mka’ => ‘audio/x-matroska’,
// Misc application formats.
‘rtf’ => ‘application/rtf’,
‘js’ => ‘application/javascript’,
‘pdf’ => ‘application/pdf’,
‘swf’ => ‘application/x-shockwave-flash’,
‘class’ => ‘application/java’,
‘tar’ => ‘application/x-tar’,
‘zip’ => ‘application/zip’,
‘gz|gzip’ => ‘application/x-gzip’,
‘rar’ => ‘application/rar’,
‘7z’ => ‘application/x-7z-compressed’,
‘exe’ => ‘application/x-msdownload’,
‘psd’ => ‘application/octet-stream’,
‘xcf’ => ‘application/octet-stream’,
// MS Office formats.
‘doc’ => ‘application/msword’,
‘pot|pps|ppt’ => ‘application/vnd.ms-powerpoint’,
‘wri’ => ‘application/vnd.ms-write’,
‘xla|xls|xlt|xlw’ => ‘application/vnd.ms-excel’,
‘mdb’ => ‘application/vnd.ms-access’,
‘mpp’ => ‘application/vnd.ms-project’,
‘docx’ => ‘application/vnd.openxmlformats-officedocument.wordprocessingml.document’,
‘docm’ => ‘application/vnd.ms-word.document.macroEnabled.12’,
‘dotx’ => ‘application/vnd.openxmlformats-officedocument.wordprocessingml.template’,
‘dotm’ => ‘application/vnd.ms-word.template.macroEnabled.12’,
‘xlsx’ => ‘application/vnd.openxmlformats-officedocument.spreadsheetml.sheet’,
‘xlsm’ => ‘application/vnd.ms-excel.sheet.macroEnabled.12’,
‘xlsb’ => ‘application/vnd.ms-excel.sheet.binary.macroEnabled.12’,
‘xltx’ => ‘application/vnd.openxmlformats-officedocument.spreadsheetml.template’,
‘xltm’ => ‘application/vnd.ms-excel.template.macroEnabled.12’,
‘xlam’ => ‘application/vnd.ms-excel.addin.macroEnabled.12’,
‘pptx’ => ‘application/vnd.openxmlformats-officedocument.presentationml.presentation’,
‘pptm’ => ‘application/vnd.ms-powerpoint.presentation.macroEnabled.12’,
‘ppsx’ => ‘application/vnd.openxmlformats-officedocument.presentationml.slideshow’,
‘ppsm’ => ‘application/vnd.ms-powerpoint.slideshow.macroEnabled.12’,
‘potx’ => ‘application/vnd.openxmlformats-officedocument.presentationml.template’,
‘potm’ => ‘application/vnd.ms-powerpoint.template.macroEnabled.12’,
‘ppam’ => ‘application/vnd.ms-powerpoint.addin.macroEnabled.12’,
‘sldx’ => ‘application/vnd.openxmlformats-officedocument.presentationml.slide’,
‘sldm’ => ‘application/vnd.ms-powerpoint.slide.macroEnabled.12’,
‘onetoc|onetoc2|onetmp|onepkg’ => ‘application/onenote’,
‘oxps’ => ‘application/oxps’,
‘xps’ => ‘application/vnd.ms-xpsdocument’,
// OpenOffice formats.
‘odt’ => ‘application/vnd.oasis.opendocument.text’,
‘odp’ => ‘application/vnd.oasis.opendocument.presentation’,
‘ods’ => ‘application/vnd.oasis.opendocument.spreadsheet’,
‘odg’ => ‘application/vnd.oasis.opendocument.graphics’,
‘odc’ => ‘application/vnd.oasis.opendocument.chart’,
‘odb’ => ‘application/vnd.oasis.opendocument.database’,
‘odf’ => ‘application/vnd.oasis.opendocument.formula’,
// WordPerfect formats.
‘wp|wpd’ => ‘application/wordperfect’,
// iWork formats.
‘key’ => ‘application/vnd.apple.keynote’,
‘numbers’ => ‘application/vnd.apple.numbers’,
‘pages’ => ‘application/vnd.apple.pages’,
) );
}

/**
* Retrieves the list of common file extensions and their types.
*
* @since 4.6.0
*
* @return array Array of file extensions types keyed by the type of file.
*/
function wp_get_ext_types() {

/**
* Filters file type based on the extension name.
*
* @since 2.5.0
*
* @see wp_ext2type()
*
* @param array $ext2type Multi-dimensional array with extensions for a default set
* of file types.
*/
return apply_filters( ‘ext2type’, array(
‘image’ => array( ‘jpg’, ‘jpeg’, ‘jpe’, ‘gif’, ‘png’, ‘bmp’, ‘tif’, ‘tiff’, ‘ico’ ),
‘audio’ => array( ‘aac’, ‘ac3’, ‘aif’, ‘aiff’, ‘m3a’, ‘m4a’, ‘m4b’, ‘mka’, ‘mp1’, ‘mp2’, ‘mp3’, ‘ogg’, ‘oga’, ‘ram’, ‘wav’, ‘wma’ ),
‘video’ => array( ‘3g2’, ‘3gp’, ‘3gpp’, ‘asf’, ‘avi’, ‘divx’, ‘dv’, ‘flv’, ‘m4v’, ‘mkv’, ‘mov’, ‘mp4’, ‘mpeg’, ‘mpg’, ‘mpv’, ‘ogm’, ‘ogv’, ‘qt’, ‘rm’, ‘vob’, ‘wmv’ ),
‘document’ => array( ‘doc’, ‘docx’, ‘docm’, ‘dotm’, ‘odt’, ‘pages’, ‘pdf’, ‘xps’, ‘oxps’, ‘rtf’, ‘wp’, ‘wpd’, ‘psd’, ‘xcf’ ),
‘spreadsheet’ => array( ‘numbers’, ‘ods’, ‘xls’, ‘xlsx’, ‘xlsm’, ‘xlsb’ ),
‘interactive’ => array( ‘swf’, ‘key’, ‘ppt’, ‘pptx’, ‘pptm’, ‘pps’, ‘ppsx’, ‘ppsm’, ‘sldx’, ‘sldm’, ‘odp’ ),
‘text’ => array( ‘asc’, ‘csv’, ‘tsv’, ‘txt’ ),
‘archive’ => array( ‘bz2’, ‘cab’, ‘dmg’, ‘gz’, ‘rar’, ‘sea’, ‘sit’, ‘sqx’, ‘tar’, ‘tgz’, ‘zip’, ‘7z’ ),
‘code’ => array( ‘css’, ‘htm’, ‘html’, ‘php’, ‘js’ ),
) );
}

/**
* Retrieve list of allowed mime types and file extensions.
*
* @since 2.8.6
*
* @param int|WP_User $user Optional. User to check. Defaults to current user.
* @return array Array of mime types keyed by the file extension regex corresponding
* to those types.
*/
function get_allowed_mime_types( $user = null ) {
$t = wp_get_mime_types();

unset( $t[‘swf’], $t[‘exe’] );
if ( function_exists( ‘current_user_can’ ) )
$unfiltered = $user ? user_can( $user, ‘unfiltered_html’ ) : current_user_can( ‘unfiltered_html’ );

if ( empty( $unfiltered ) ) {
unset( $t[‘htm|html’], $t[‘js’] );
}

/**
* Filters list of allowed mime types and file extensions.
*
* @since 2.0.0
*
* @param array $t Mime types keyed by the file extension regex corresponding to
* those types. ‘swf’ and ‘exe’ removed from full list. ‘htm|html’ also
* removed depending on ‘$user’ capabilities.
* @param int|WP_User|null $user User ID, User object or null if not provided (indicates current user).
*/
return apply_filters( ‘upload_mimes’, $t, $user );
}

/**
* Display “Are You Sure” message to confirm the action being taken.
*
* If the action has the nonce explain message, then it will be displayed
* along with the “Are you sure?” message.
*
* @since 2.0.4
*
* @param string $action The nonce action.
*/
function wp_nonce_ays( $action ) {
if ( ‘log-out’ == $action ) {
$html = sprintf( __( ‘You are attempting to log out of %s’ ), get_bloginfo( ‘name’ ) ) . ‘</p><p>’;
$redirect_to = isset( $_REQUEST[‘redirect_to’] ) ? $_REQUEST[‘redirect_to’] : ”;
$html .= sprintf( __( “Do you really want to <a href=’%s’>log out</a>?”), wp_logout_url( $redirect_to ) );
} else {
$html = __( ‘Are you sure you want to do this?’ );
if ( wp_get_referer() )
$html .= “</p><p><a href='” . esc_url( remove_query_arg( ‘updated’, wp_get_referer() ) ) . “‘>” . __( ‘Please try again.’ ) . “</a>”;
}

wp_die( $html, __( ‘WordPress Failure Notice’ ), 403 );
}

/**
* Kill WordPress execution and display HTML message with error message.
*
* This function complements the die() PHP function. The difference is that
* HTML will be displayed to the user. It is recommended to use this function
* only when the execution should not continue any further. It is not recommended
* to call this function very often, and try to handle as many errors as possible
* silently or more gracefully.
*
* As a shorthand, the desired HTTP response code may be passed as an integer to
* the $title parameter (the default title would apply) or the $args parameter.
*
* @since 2.0.4
* @since 4.1.0 The $title and $args parameters were changed to optionally accept
* an integer to be used as the response code.
*
* @param string|WP_Error $message Optional. Error message. If this is a WP_Error object,
* the error’s messages are used. Default empty.
* @param string|int $title Optional. Error title. If $message is a WP_Error object,
* error data with the key ‘title’ may be used to specify the title.
* If $title is an integer, then it is treated as the response
* code. Default empty.
* @param string|array|int $args {
* Optional. Arguments to control behavior. If $args is an integer, then it is treated
* as the response code. Default empty array.
*
* @type int $response The HTTP response code. Default 500.
* @type bool $back_link Whether to include a link to go back. Default false.
* @type string $text_direction The text direction. This is only useful internally, when WordPress
* is still loading and the site’s locale is not set up yet. Accepts ‘rtl’.
* Default is the value of is_rtl().
* }
*/
function wp_die( $message = ”, $title = ”, $args = array() ) {

if ( is_int( $args ) ) {
$args = array( ‘response’ => $args );
} elseif ( is_int( $title ) ) {
$args = array( ‘response’ => $title );
$title = ”;
}

if ( defined( ‘DOING_AJAX’ ) && DOING_AJAX ) {
/**
* Filters the callback for killing WordPress execution for Ajax requests.
*
* @since 3.4.0
*
* @param callable $function Callback function name.
*/
$function = apply_filters( ‘wp_die_ajax_handler’, ‘_ajax_wp_die_handler’ );
} elseif ( defined( ‘XMLRPC_REQUEST’ ) && XMLRPC_REQUEST ) {
/**
* Filters the callback for killing WordPress execution for XML-RPC requests.
*
* @since 3.4.0
*
* @param callable $function Callback function name.
*/
$function = apply_filters( ‘wp_die_xmlrpc_handler’, ‘_xmlrpc_wp_die_handler’ );
} else {
/**
* Filters the callback for killing WordPress execution for all non-Ajax, non-XML-RPC requests.
*
* @since 3.0.0
*
* @param callable $function Callback function name.
*/
$function = apply_filters( ‘wp_die_handler’, ‘_default_wp_die_handler’ );
}

call_user_func( $function, $message, $title, $args );
}

/**
* Kills WordPress execution and display HTML message with error message.
*
* This is the default handler for wp_die if you want a custom one for your
* site then you can overload using the {@see ‘wp_die_handler’} filter in wp_die().
*
* @since 3.0.0
* @access private
*
* @param string $message Error message.
* @param string $title Optional. Error title. Default empty.
* @param string|array $args Optional. Arguments to control behavior. Default empty array.
*/
function _default_wp_die_handler( $message, $title = ”, $args = array() ) {
$defaults = array( ‘response’ => 500 );
$r = wp_parse_args($args, $defaults);

$have_gettext = function_exists(‘__’);

if ( function_exists( ‘is_wp_error’ ) && is_wp_error( $message ) ) {
if ( empty( $title ) ) {
$error_data = $message->get_error_data();
if ( is_array( $error_data ) && isset( $error_data[‘title’] ) )
$title = $error_data[‘title’];
}
$errors = $message->get_error_messages();
switch ( count( $errors ) ) {
case 0 :
$message = ”;
break;
case 1 :
$message = “<p>{$errors[0]}</p>”;
break;
default :
$message = “<ul>\n\t\t<li>” . join( “</li>\n\t\t<li>”, $errors ) . “</li>\n\t</ul>”;
break;
}
} elseif ( is_string( $message ) ) {
$message = “<p>$message</p>”;
}

if ( isset( $r[‘back_link’] ) && $r[‘back_link’] ) {
$back_text = $have_gettext? __(‘« Back’) : ‘« Back’;
$message .= “\n<p><a href=’javascript:history.back()’>$back_text</a></p>”;
}

if ( ! did_action( ‘admin_head’ ) ) :
if ( !headers_sent() ) {
status_header( $r[‘response’] );
nocache_headers();
header( ‘Content-Type: text/html; charset=utf-8’ );
}

if ( empty($title) )
$title = $have_gettext ? __(‘WordPress › Error’) : ‘WordPress › Error’;

$text_direction = ‘ltr’;
if ( isset($r[‘text_direction’]) && ‘rtl’ == $r[‘text_direction’] )
$text_direction = ‘rtl’;
elseif ( function_exists( ‘is_rtl’ ) && is_rtl() )
$text_direction = ‘rtl’;
?>
<!DOCTYPE html>
<!– Ticket #11289, IE bug fix: always pad the error page with enough characters such that it is greater than 512 bytes, even after gzip compression abcdefghijklmnopqrstuvwxyz1234567890aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz11223344556677889900abacbcbdcdcededfefegfgfhghgihihjijikjkjlklkmlmlnmnmononpopoqpqprqrqsrsrtstsubcbcdcdedefefgfabcadefbghicjkldmnoepqrfstugvwxhyz1i234j567k890laabmbccnddeoeffpgghqhiirjjksklltmmnunoovppqwqrrxsstytuuzvvw0wxx1yyz2z113223434455666777889890091abc2def3ghi4jkl5mno6pqr7stu8vwx9yz11aab2bcc3dd4ee5ff6gg7hh8ii9j0jk1kl2lmm3nnoo4p5pq6qrr7ss8tt9uuvv0wwx1x2yyzz13aba4cbcb5dcdc6dedfef8egf9gfh0ghg1ihi2hji3jik4jkj5lkl6kml7mln8mnm9ono
–>
<html xmlns=”http://www.w3.org/1999/xhtml” <?php if ( function_exists( ‘language_attributes’ ) && function_exists( ‘is_rtl’ ) ) language_attributes(); else echo “dir=’$text_direction'”; ?>>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<meta name=”viewport” content=”width=device-width”>
<?php
if ( function_exists( ‘wp_no_robots’ ) ) {
wp_no_robots();
}
?>
<title><?php echo $title ?></title>
<style type=”text/css”>
html {
background: #f1f1f1;
}
body {
background: #fff;
color: #444;
font-family: -apple-system, BlinkMacSystemFont, “Segoe UI”, Roboto, Oxygen-Sans, Ubuntu, Cantarell, “Helvetica Neue”, sans-serif;
margin: 2em auto;
padding: 1em 2em;
max-width: 700px;
-webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.13);
box-shadow: 0 1px 3px rgba(0,0,0,0.13);
}
h1 {
border-bottom: 1px solid #dadada;
clear: both;
color: #666;
font-size: 24px;
margin: 30px 0 0 0;
padding: 0;
padding-bottom: 7px;
}
#error-page {
margin-top: 50px;
}
#error-page p {
font-size: 14px;
line-height: 1.5;
margin: 25px 0 20px;
}
#error-page code {
font-family: Consolas, Monaco, monospace;
}
ul li {
margin-bottom: 10px;
font-size: 14px ;
}
a {
color: #0073aa;
}
a:hover,
a:active {
color: #00a0d2;
}
a:focus {
color: #124964;
-webkit-box-shadow:
0 0 0 1px #5b9dd9,
0 0 2px 1px rgba(30, 140, 190, .8);
box-shadow:
0 0 0 1px #5b9dd9,
0 0 2px 1px rgba(30, 140, 190, .8);
outline: none;
}
.button {
background: #f7f7f7;
border: 1px solid #ccc;
color: #555;
display: inline-block;
text-decoration: none;
font-size: 13px;
line-height: 26px;
height: 28px;
margin: 0;
padding: 0 10px 1px;
cursor: pointer;
-webkit-border-radius: 3px;
-webkit-appearance: none;
border-radius: 3px;
white-space: nowrap;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;

-webkit-box-shadow: 0 1px 0 #ccc;
box-shadow: 0 1px 0 #ccc;
vertical-align: top;
}

.button.button-large {
height: 30px;
line-height: 28px;
padding: 0 12px 2px;
}

.button:hover,
.button:focus {
background: #fafafa;
border-color: #999;
color: #23282d;
}

.button:focus {
border-color: #5b9dd9;
-webkit-box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
outline: none;
}

.button:active {
background: #eee;
border-color: #999;
-webkit-box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
-webkit-transform: translateY(1px);
-ms-transform: translateY(1px);
transform: translateY(1px);
}

<?php
if ( ‘rtl’ == $text_direction ) {
echo ‘body { font-family: Tahoma, Arial; }’;
}
?>
</style>
</head>
<body id=”error-page”>
<?php endif; // ! did_action( ‘admin_head’ ) ?>
<?php echo $message; ?>
</body>
</html>
<?php
die();
}

/**
* Kill WordPress execution and display XML message with error message.
*
* This is the handler for wp_die when processing XMLRPC requests.
*
* @since 3.2.0
* @access private
*
* @global wp_xmlrpc_server $wp_xmlrpc_server
*
* @param string $message Error message.
* @param string $title Optional. Error title. Default empty.
* @param string|array $args Optional. Arguments to control behavior. Default empty array.
*/
function _xmlrpc_wp_die_handler( $message, $title = ”, $args = array() ) {
global $wp_xmlrpc_server;
$defaults = array( ‘response’ => 500 );

$r = wp_parse_args($args, $defaults);

if ( $wp_xmlrpc_server ) {
$error = new IXR_Error( $r[‘response’] , $message);
$wp_xmlrpc_server->output( $error->getXml() );
}
die();
}

/**
* Kill WordPress ajax execution.
*
* This is the handler for wp_die when processing Ajax requests.
*
* @since 3.4.0
* @access private
*
* @param string $message Optional. Response to print. Default empty.
*/
function _ajax_wp_die_handler( $message = ” ) {
if ( is_scalar( $message ) )
die( (string) $message );
die( ‘0’ );
}

/**
* Kill WordPress execution.
*
* This is the handler for wp_die when processing APP requests.
*
* @since 3.4.0
* @access private
*
* @param string $message Optional. Response to print. Default empty.
*/
function _scalar_wp_die_handler( $message = ” ) {
if ( is_scalar( $message ) )
die( (string) $message );
die();
}

/**
* Encode a variable into JSON, with some sanity checks.
*
* @since 4.1.0
*
* @param mixed $data Variable (usually an array or object) to encode as JSON.
* @param int $options Optional. Options to be passed to json_encode(). Default 0.
* @param int $depth Optional. Maximum depth to walk through $data. Must be
* greater than 0. Default 512.
* @return string|false The JSON encoded string, or false if it cannot be encoded.
*/
function wp_json_encode( $data, $options = 0, $depth = 512 ) {
/*
* json_encode() has had extra params added over the years.
* $options was added in 5.3, and $depth in 5.5.
* We need to make sure we call it with the correct arguments.
*/
if ( version_compare( PHP_VERSION, ‘5.5’, ‘>=’ ) ) {
$args = array( $data, $options, $depth );
} elseif ( version_compare( PHP_VERSION, ‘5.3’, ‘>=’ ) ) {
$args = array( $data, $options );
} else {
$args = array( $data );
}

// Prepare the data for JSON serialization.
$args[0] = _wp_json_prepare_data( $data );

$json = @call_user_func_array( ‘json_encode’, $args );

// If json_encode() was successful, no need to do more sanity checking.
// … unless we’re in an old version of PHP, and json_encode() returned
// a string containing ‘null’. Then we need to do more sanity checking.
if ( false !== $json && ( version_compare( PHP_VERSION, ‘5.5’, ‘>=’ ) || false === strpos( $json, ‘null’ ) ) ) {
return $json;
}

try {
$args[0] = _wp_json_sanity_check( $data, $depth );
} catch ( Exception $e ) {
return false;
}

return call_user_func_array( ‘json_encode’, $args );
}

/**
* Perform sanity checks on data that shall be encoded to JSON.
*
* @ignore
* @since 4.1.0
* @access private
*
* @see wp_json_encode()
*
* @param mixed $data Variable (usually an array or object) to encode as JSON.
* @param int $depth Maximum depth to walk through $data. Must be greater than 0.
* @return mixed The sanitized data that shall be encoded to JSON.
*/
function _wp_json_sanity_check( $data, $depth ) {
if ( $depth < 0 ) {
throw new Exception( ‘Reached depth limit’ );
}

if ( is_array( $data ) ) {
$output = array();
foreach ( $data as $id => $el ) {
// Don’t forget to sanitize the ID!
if ( is_string( $id ) ) {
$clean_id = _wp_json_convert_string( $id );
} else {
$clean_id = $id;
}

// Check the element type, so that we’re only recursing if we really have to.
if ( is_array( $el ) || is_object( $el ) ) {
$output[ $clean_id ] = _wp_json_sanity_check( $el, $depth – 1 );
} elseif ( is_string( $el ) ) {
$output[ $clean_id ] = _wp_json_convert_string( $el );
} else {
$output[ $clean_id ] = $el;
}
}
} elseif ( is_object( $data ) ) {
$output = new stdClass;
foreach ( $data as $id => $el ) {
if ( is_string( $id ) ) {
$clean_id = _wp_json_convert_string( $id );
} else {
$clean_id = $id;
}

if ( is_array( $el ) || is_object( $el ) ) {
$output->$clean_id = _wp_json_sanity_check( $el, $depth – 1 );
} elseif ( is_string( $el ) ) {
$output->$clean_id = _wp_json_convert_string( $el );
} else {
$output->$clean_id = $el;
}
}
} elseif ( is_string( $data ) ) {
return _wp_json_convert_string( $data );
} else {
return $data;
}

return $output;
}

/**
* Convert a string to UTF-8, so that it can be safely encoded to JSON.
*
* @ignore
* @since 4.1.0
* @access private
*
* @see _wp_json_sanity_check()
*
* @staticvar bool $use_mb
*
* @param string $string The string which is to be converted.
* @return string The checked string.
*/
function _wp_json_convert_string( $string ) {
static $use_mb = null;
if ( is_null( $use_mb ) ) {
$use_mb = function_exists( ‘mb_convert_encoding’ );
}

if ( $use_mb ) {
$encoding = mb_detect_encoding( $string, mb_detect_order(), true );
if ( $encoding ) {
return mb_convert_encoding( $string, ‘UTF-8’, $encoding );
} else {
return mb_convert_encoding( $string, ‘UTF-8’, ‘UTF-8’ );
}
} else {
return wp_check_invalid_utf8( $string, true );
}
}

/**
* Prepares response data to be serialized to JSON.
*
* This supports the JsonSerializable interface for PHP 5.2-5.3 as well.
*
* @ignore
* @since 4.4.0
* @access private
*
* @param mixed $data Native representation.
* @return bool|int|float|null|string|array Data ready for json_encode().
*/
function _wp_json_prepare_data( $data ) {
if ( ! defined( ‘WP_JSON_SERIALIZE_COMPATIBLE’ ) || WP_JSON_SERIALIZE_COMPATIBLE === false ) {
return $data;
}

switch ( gettype( $data ) ) {
case ‘boolean’:
case ‘integer’:
case ‘double’:
case ‘string’:
case ‘NULL’:
// These values can be passed through.
return $data;

case ‘array’:
// Arrays must be mapped in case they also return objects.
return array_map( ‘_wp_json_prepare_data’, $data );

case ‘object’:
// If this is an incomplete object (__PHP_Incomplete_Class), bail.
if ( ! is_object( $data ) ) {
return null;
}

if ( $data instanceof JsonSerializable ) {
$data = $data->jsonSerialize();
} else {
$data = get_object_vars( $data );
}

// Now, pass the array (or whatever was returned from jsonSerialize through).
return _wp_json_prepare_data( $data );

default:
return null;
}
}

/**
* Send a JSON response back to an Ajax request.
*
* @since 3.5.0
*
* @param mixed $response Variable (usually an array or object) to encode as JSON,
* then print and die.
*/
function wp_send_json( $response ) {
@header( ‘Content-Type: application/json; charset=’ . get_option( ‘blog_charset’ ) );
echo wp_json_encode( $response );
if ( defined( ‘DOING_AJAX’ ) && DOING_AJAX )
wp_die();
else
die;
}

/**
* Send a JSON response back to an Ajax request, indicating success.
*
* @since 3.5.0
*
* @param mixed $data Data to encode as JSON, then print and die.
*/
function wp_send_json_success( $data = null ) {
$response = array( ‘success’ => true );

if ( isset( $data ) )
$response[‘data’] = $data;

wp_send_json( $response );
}

/**
* Send a JSON response back to an Ajax request, indicating failure.
*
* If the $data parameter is a WP_Error object, the errors
* within the object are processed and output as an array of error
* codes and corresponding messages. All other types are output
* without further processing.
*
* @since 3.5.0
* @since 4.1.0 The $data parameter is now processed if a WP_Error object is passed in.
*
* @param mixed $data Data to encode as JSON, then print and die.
*/
function wp_send_json_error( $data = null ) {
$response = array( ‘success’ => false );

if ( isset( $data ) ) {
if ( is_wp_error( $data ) ) {
$result = array();
foreach ( $data->errors as $code => $messages ) {
foreach ( $messages as $message ) {
$result[] = array( ‘code’ => $code, ‘message’ => $message );
}
}

$response[‘data’] = $result;
} else {
$response[‘data’] = $data;
}
}

wp_send_json( $response );
}

/**
* Checks that a JSONP callback is a valid JavaScript callback.
*
* Only allows alphanumeric characters and the dot character in callback
* function names. This helps to mitigate XSS attacks caused by directly
* outputting user input.
*
* @since 4.6.0
*
* @param string $callback Supplied JSONP callback function.
* @return bool True if valid callback, otherwise false.
*/
function wp_check_jsonp_callback( $callback ) {
if ( ! is_string( $callback ) ) {
return false;
}

$jsonp_callback = preg_replace( ‘/[^\w\.]/’, ”, $callback, -1, $illegal_char_count );

return 0 === $illegal_char_count;
}

/**
* Retrieve the WordPress home page URL.
*
* If the constant named ‘WP_HOME’ exists, then it will be used and returned
* by the function. This can be used to counter the redirection on your local
* development environment.
*
* @since 2.2.0
* @access private
*
* @see WP_HOME
*
* @param string $url URL for the home location.
* @return string Homepage location.
*/
function _config_wp_home( $url = ” ) {
if ( defined( ‘WP_HOME’ ) )
return untrailingslashit( WP_HOME );
return $url;
}

/**
* Retrieve the WordPress site URL.
*
* If the constant named ‘WP_SITEURL’ is defined, then the value in that
* constant will always be returned. This can be used for debugging a site
* on your localhost while not having to change the database to your URL.
*
* @since 2.2.0
* @access private
*
* @see WP_SITEURL
*
* @param string $url URL to set the WordPress site location.
* @return string The WordPress Site URL.
*/
function _config_wp_siteurl( $url = ” ) {
if ( defined( ‘WP_SITEURL’ ) )
return untrailingslashit( WP_SITEURL );
return $url;
}

/**
* Set the localized direction for MCE plugin.
*
* Will only set the direction to ‘rtl’, if the WordPress locale has
* the text direction set to ‘rtl’.
*
* Fills in the ‘directionality’ setting, enables the ‘directionality’
* plugin, and adds the ‘ltr’ button to ‘toolbar1’, formerly
* ‘theme_advanced_buttons1’ array keys. These keys are then returned
* in the $mce_init (TinyMCE settings) array.
*
* @since 2.1.0
* @access private
*
* @param array $mce_init MCE settings array.
* @return array Direction set for ‘rtl’, if needed by locale.
*/
function _mce_set_direction( $mce_init ) {
if ( is_rtl() ) {
$mce_init[‘directionality’] = ‘rtl’;
$mce_init[‘rtl_ui’] = true;

if ( ! empty( $mce_init[‘plugins’] ) && strpos( $mce_init[‘plugins’], ‘directionality’ ) === false ) {
$mce_init[‘plugins’] .= ‘,directionality’;
}

if ( ! empty( $mce_init[‘toolbar1’] ) && ! preg_match( ‘/\bltr\b/’, $mce_init[‘toolbar1’] ) ) {
$mce_init[‘toolbar1’] .= ‘,ltr’;
}
}

return $mce_init;
}

/**
* Convert smiley code to the icon graphic file equivalent.
*
* You can turn off smilies, by going to the write setting screen and unchecking
* the box, or by setting ‘use_smilies’ option to false or removing the option.
*
* Plugins may override the default smiley list by setting the $wpsmiliestrans
* to an array, with the key the code the blogger types in and the value the
* image file.
*
* The $wp_smiliessearch global is for the regular expression and is set each
* time the function is called.
*
* The full list of smilies can be found in the function and won’t be listed in
* the description. Probably should create a Codex page for it, so that it is
* available.
*
* @global array $wpsmiliestrans
* @global array $wp_smiliessearch
*
* @since 2.2.0
*/
function smilies_init() {
global $wpsmiliestrans, $wp_smiliessearch;

// don’t bother setting up smilies if they are disabled
if ( !get_option( ‘use_smilies’ ) )
return;

if ( !isset( $wpsmiliestrans ) ) {
$wpsmiliestrans = array(
‘:mrgreen:’ => ‘mrgreen.png’,
‘:neutral:’ => “\xf0\x9f\x98\x90”,
‘:twisted:’ => “\xf0\x9f\x98\x88”,
‘:arrow:’ => “\xe2\x9e\xa1”,
‘:shock:’ => “\xf0\x9f\x98\xaf”,
‘:smile:’ => “\xf0\x9f\x99\x82”,
‘:???:’ => “\xf0\x9f\x98\x95”,
‘:cool:’ => “\xf0\x9f\x98\x8e”,
‘:evil:’ => “\xf0\x9f\x91\xbf”,
‘:grin:’ => “\xf0\x9f\x98\x80”,
‘:idea:’ => “\xf0\x9f\x92\xa1”,
‘:oops:’ => “\xf0\x9f\x98\xb3”,
‘:razz:’ => “\xf0\x9f\x98\x9b”,
‘:roll:’ => “\xf0\x9f\x99\x84”,
‘:wink:’ => “\xf0\x9f\x98\x89”,
‘:cry:’ => “\xf0\x9f\x98\xa5”,
‘:eek:’ => “\xf0\x9f\x98\xae”,
‘:lol:’ => “\xf0\x9f\x98\x86”,
‘:mad:’ => “\xf0\x9f\x98\xa1”,
‘:sad:’ => “\xf0\x9f\x99\x81”,
‘8-)’ => “\xf0\x9f\x98\x8e”,
‘8-O’ => “\xf0\x9f\x98\xaf”,
‘:-(‘ => “\xf0\x9f\x99\x81”,
‘:-)’ => “\xf0\x9f\x99\x82”,
‘:-?’ => “\xf0\x9f\x98\x95”,
‘:-D’ => “\xf0\x9f\x98\x80”,
‘:-P’ => “\xf0\x9f\x98\x9b”,
‘:-o’ => “\xf0\x9f\x98\xae”,
‘:-x’ => “\xf0\x9f\x98\xa1”,
‘:-|’ => “\xf0\x9f\x98\x90”,
‘;-)’ => “\xf0\x9f\x98\x89”,
// This one transformation breaks regular text with frequency.
// ‘8)’ => “\xf0\x9f\x98\x8e”,
‘8O’ => “\xf0\x9f\x98\xaf”,
‘:(‘ => “\xf0\x9f\x99\x81”,
‘:)’ => “\xf0\x9f\x99\x82”,
‘:?’ => “\xf0\x9f\x98\x95”,
‘:D’ => “\xf0\x9f\x98\x80”,
‘:P’ => “\xf0\x9f\x98\x9b”,
‘:o’ => “\xf0\x9f\x98\xae”,
‘:x’ => “\xf0\x9f\x98\xa1”,
‘:|’ => “\xf0\x9f\x98\x90”,
‘;)’ => “\xf0\x9f\x98\x89”,
‘:!:’ => “\xe2\x9d\x97”,
‘:?:’ => “\xe2\x9d\x93”,
);
}

if (count($wpsmiliestrans) == 0) {
return;
}

/*
* NOTE: we sort the smilies in reverse key order. This is to make sure
* we match the longest possible smilie (:???: vs :?) as the regular
* expression used below is first-match
*/
krsort($wpsmiliestrans);

$spaces = wp_spaces_regexp();

// Begin first “subpattern”
$wp_smiliessearch = ‘/(?<=’ . $spaces . ‘|^)’;

$subchar = ”;
foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
$firstchar = substr($smiley, 0, 1);
$rest = substr($smiley, 1);

// new subpattern?
if ($firstchar != $subchar) {
if ($subchar != ”) {
$wp_smiliessearch .= ‘)(?=’ . $spaces . ‘|$)’; // End previous “subpattern”
$wp_smiliessearch .= ‘|(?<=’ . $spaces . ‘|^)’; // Begin another “subpattern”
}
$subchar = $firstchar;
$wp_smiliessearch .= preg_quote($firstchar, ‘/’) . ‘(?:’;
} else {
$wp_smiliessearch .= ‘|’;
}
$wp_smiliessearch .= preg_quote($rest, ‘/’);
}

$wp_smiliessearch .= ‘)(?=’ . $spaces . ‘|$)/m’;

}

/**
* Merge user defined arguments into defaults array.
*
* This function is used throughout WordPress to allow for both string or array
* to be merged into another array.
*
* @since 2.2.0
*
* @param string|array $args Value to merge with $defaults
* @param array $defaults Optional. Array that serves as the defaults. Default empty.
* @return array Merged user defined values with defaults.
*/
function wp_parse_args( $args, $defaults = ” ) {
if ( is_object( $args ) )
$r = get_object_vars( $args );
elseif ( is_array( $args ) )
$r =& $args;
else
wp_parse_str( $args, $r );

if ( is_array( $defaults ) )
return array_merge( $defaults, $r );
return $r;
}

/**
* Clean up an array, comma- or space-separated list of IDs.
*
* @since 3.0.0
*
* @param array|string $list List of ids.
* @return array Sanitized array of IDs.
*/
function wp_parse_id_list( $list ) {
if ( !is_array($list) )
$list = preg_split(‘/[\s,]+/’, $list);

return array_unique(array_map(‘absint’, $list));
}

/**
* Extract a slice of an array, given a list of keys.
*
* @since 3.1.0
*
* @param array $array The original array.
* @param array $keys The list of keys.
* @return array The array slice.
*/
function wp_array_slice_assoc( $array, $keys ) {
$slice = array();
foreach ( $keys as $key )
if ( isset( $array[ $key ] ) )
$slice[ $key ] = $array[ $key ];

return $slice;
}

/**
* Determines if the variable is a numeric-indexed array.
*
* @since 4.4.0
*
* @param mixed $data Variable to check.
* @return bool Whether the variable is a list.
*/
function wp_is_numeric_array( $data ) {
if ( ! is_array( $data ) ) {
return false;
}

$keys = array_keys( $data );
$string_keys = array_filter( $keys, ‘is_string’ );
return count( $string_keys ) === 0;
}

/**
* Filters a list of objects, based on a set of key => value arguments.
*
* @since 3.0.0
*
* @param array $list An array of objects to filter
* @param array $args Optional. An array of key => value arguments to match
* against each object. Default empty array.
* @param string $operator Optional. The logical operation to perform. ‘or’ means
* only one element from the array needs to match; ‘and’
* means all elements must match; ‘not’ means no elements may
* match. Default ‘and’.
* @param bool|string $field A field from the object to place instead of the entire object.
* Default false.
* @return array A list of objects or object fields.
*/
function wp_filter_object_list( $list, $args = array(), $operator = ‘and’, $field = false ) {
if ( ! is_array( $list ) )
return array();

$list = wp_list_filter( $list, $args, $operator );

if ( $field )
$list = wp_list_pluck( $list, $field );

return $list;
}

/**
* Filters a list of objects, based on a set of key => value arguments.
*
* @since 3.1.0
*
* @param array $list An array of objects to filter.
* @param array $args Optional. An array of key => value arguments to match
* against each object. Default empty array.
* @param string $operator Optional. The logical operation to perform. ‘AND’ means
* all elements from the array must match. ‘OR’ means only
* one element needs to match. ‘NOT’ means no elements may
* match. Default ‘AND’.
* @return array Array of found values.
*/
function wp_list_filter( $list, $args = array(), $operator = ‘AND’ ) {
if ( ! is_array( $list ) )
return array();

if ( empty( $args ) )
return $list;

$operator = strtoupper( $operator );
$count = count( $args );
$filtered = array();

foreach ( $list as $key => $obj ) {
$to_match = (array) $obj;

$matched = 0;
foreach ( $args as $m_key => $m_value ) {
if ( array_key_exists( $m_key, $to_match ) && $m_value == $to_match[ $m_key ] )
$matched++;
}

if ( ( ‘AND’ == $operator && $matched == $count )
|| ( ‘OR’ == $operator && $matched > 0 )
|| ( ‘NOT’ == $operator && 0 == $matched ) ) {
$filtered[$key] = $obj;
}
}

return $filtered;
}

/**
* Pluck a certain field out of each object in a list.
*
* This has the same functionality and prototype of
* array_column() (PHP 5.5) but also supports objects.
*
* @since 3.1.0
* @since 4.0.0 $index_key parameter added.
*
* @param array $list List of objects or arrays
* @param int|string $field Field from the object to place instead of the entire object
* @param int|string $index_key Optional. Field from the object to use as keys for the new array.
* Default null.
* @return array Array of found values. If $index_key is set, an array of found values with keys
* corresponding to $index_key. If $index_key is null, array keys from the original
* $list will be preserved in the results.
*/
function wp_list_pluck( $list, $field, $index_key = null ) {
if ( ! $index_key ) {
/*
* This is simple. Could at some point wrap array_column()
* if we knew we had an array of arrays.
*/
foreach ( $list as $key => $value ) {
if ( is_object( $value ) ) {
$list[ $key ] = $value->$field;
} else {
$list[ $key ] = $value[ $field ];
}
}
return $list;
}

/*
* When index_key is not set for a particular item, push the value
* to the end of the stack. This is how array_column() behaves.
*/
$newlist = array();
foreach ( $list as $value ) {
if ( is_object( $value ) ) {
if ( isset( $value->$index_key ) ) {
$newlist[ $value->$index_key ] = $value->$field;
} else {
$newlist[] = $value->$field;
}
} else {
if ( isset( $value[ $index_key ] ) ) {
$newlist[ $value[ $index_key ] ] = $value[ $field ];
} else {
$newlist[] = $value[ $field ];
}
}
}

return $newlist;
}

/**
* Determines if Widgets library should be loaded.
*
* Checks to make sure that the widgets library hasn’t already been loaded.
* If it hasn’t, then it will load the widgets library and run an action hook.
*
* @since 2.2.0
*/
function wp_maybe_load_widgets() {
/**
* Filters whether to load the Widgets library.
*
* Passing a falsey value to the filter will effectively short-circuit
* the Widgets library from loading.
*
* @since 2.8.0
*
* @param bool $wp_maybe_load_widgets Whether to load the Widgets library.
* Default true.
*/
if ( ! apply_filters( ‘load_default_widgets’, true ) ) {
return;
}

require_once( ABSPATH . WPINC . ‘/default-widgets.php’ );

add_action( ‘_admin_menu’, ‘wp_widgets_add_menu’ );
}

/**
* Append the Widgets menu to the themes main menu.
*
* @since 2.2.0
*
* @global array $submenu
*/
function wp_widgets_add_menu() {
global $submenu;

if ( ! current_theme_supports( ‘widgets’ ) )
return;

$submenu[‘themes.php’][7] = array( __( ‘Widgets’ ), ‘edit_theme_options’, ‘widgets.php’ );
ksort( $submenu[‘themes.php’], SORT_NUMERIC );
}

/**
* Flush all output buffers for PHP 5.2.
*
* Make sure all output buffers are flushed before our singletons are destroyed.
*
* @since 2.2.0
*/
function wp_ob_end_flush_all() {
$levels = ob_get_level();
for ($i=0; $i<$levels; $i++)
ob_end_flush();
}

/**
* Load custom DB error or display WordPress DB error.
*
* If a file exists in the wp-content directory named db-error.php, then it will
* be loaded instead of displaying the WordPress DB error. If it is not found,
* then the WordPress DB error will be displayed instead.
*
* The WordPress DB error sets the HTTP status header to 500 to try to prevent
* search engines from caching the message. Custom DB messages should do the
* same.
*
* This function was backported to WordPress 2.3.2, but originally was added
* in WordPress 2.5.0.
*
* @since 2.3.2
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
function dead_db() {
global $wpdb;

wp_load_translations_early();

// Load custom DB error template, if present.
if ( file_exists( WP_CONTENT_DIR . ‘/db-error.php’ ) ) {
require_once( WP_CONTENT_DIR . ‘/db-error.php’ );
die();
}

// If installing or in the admin, provide the verbose message.
if ( wp_installing() || defined( ‘WP_ADMIN’ ) )
wp_die($wpdb->error);

// Otherwise, be terse.
status_header( 500 );
nocache_headers();
header( ‘Content-Type: text/html; charset=utf-8’ );
?>
<!DOCTYPE html>
<html xmlns=”http://www.w3.org/1999/xhtml”<?php if ( is_rtl() ) echo ‘ dir=”rtl”‘; ?>>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title><?php _e( ‘Database Error’ ); ?></title>

</head>
<body>
<h1><?php _e( ‘Error establishing a database connection’ ); ?></h1>
</body>
</html>
<?php
die();
}

/**
* Convert a value to non-negative integer.
*
* @since 2.5.0
*
* @param mixed $maybeint Data you wish to have converted to a non-negative integer.
* @return int A non-negative integer.
*/
function absint( $maybeint ) {
return abs( intval( $maybeint ) );
}

/**
* Mark a function as deprecated and inform when it has been used.
*
* There is a {@see ‘hook deprecated_function_run’} that will be called that can be used
* to get the backtrace up to what file and function called the deprecated
* function.
*
* The current behavior is to trigger a user error if WP_DEBUG is true.
*
* This function is to be used in every function that is deprecated.
*
* @since 2.5.0
* @access private
*
* @param string $function The function that was called.
* @param string $version The version of WordPress that deprecated the function.
* @param string $replacement Optional. The function that should have been called. Default null.
*/
function _deprecated_function( $function, $version, $replacement = null ) {

/**
* Fires when a deprecated function is called.
*
* @since 2.5.0
*
* @param string $function The function that was called.
* @param string $replacement The function that should have been called.
* @param string $version The version of WordPress that deprecated the function.
*/
do_action( ‘deprecated_function_run’, $function, $replacement, $version );

/**
* Filters whether to trigger an error for deprecated functions.
*
* @since 2.5.0
*
* @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
*/
if ( WP_DEBUG && apply_filters( ‘deprecated_function_trigger_error’, true ) ) {
if ( function_exists( ‘__’ ) ) {
if ( ! is_null( $replacement ) )
trigger_error( sprintf( __(‘%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’), $function, $version, $replacement ) );
else
trigger_error( sprintf( __(‘%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.’), $function, $version ) );
} else {
if ( ! is_null( $replacement ) )
trigger_error( sprintf( ‘%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’, $function, $version, $replacement ) );
else
trigger_error( sprintf( ‘%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.’, $function, $version ) );
}
}
}

/**
* Marks a constructor as deprecated and informs when it has been used.
*
* Similar to _deprecated_function(), but with different strings. Used to
* remove PHP4 style constructors.
*
* The current behavior is to trigger a user error if WP_DEBUG is true.
*
* This function is to be used in every PHP4 style constructor method that is deprecated.
*
* @since 4.3.0
* @since 4.5.0 Added the $parent_class parameter.
*
* @access private
*
* @param string $class The class containing the deprecated constructor.
* @param string $version The version of WordPress that deprecated the function.
* @param string $parent_class Optional. The parent class calling the deprecated constructor.
* Default empty string.
*/
function _deprecated_constructor( $class, $version, $parent_class = ” ) {

/**
* Fires when a deprecated constructor is called.
*
* @since 4.3.0
* @since 4.5.0 Added the $parent_class parameter.
*
* @param string $class The class containing the deprecated constructor.
* @param string $version The version of WordPress that deprecated the function.
* @param string $parent_class The parent class calling the deprecated constructor.
*/
do_action( ‘deprecated_constructor_run’, $class, $version, $parent_class );

/**
* Filters whether to trigger an error for deprecated functions.
*
* WP_DEBUG must be true in addition to the filter evaluating to true.
*
* @since 4.3.0
*
* @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
*/
if ( WP_DEBUG && apply_filters( ‘deprecated_constructor_trigger_error’, true ) ) {
if ( function_exists( ‘__’ ) ) {
if ( ! empty( $parent_class ) ) {
/* translators: 1: PHP class name, 2: PHP parent class name, 3: version number, 4: __construct() method */
trigger_error( sprintf( __( ‘The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.’ ),
$class, $parent_class, $version, ‘<pre>__construct()</pre>’ ) );
} else {
/* translators: 1: PHP class name, 2: version number, 3: __construct() method */
trigger_error( sprintf( __( ‘The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’ ),
$class, $version, ‘<pre>__construct()</pre>’ ) );
}
} else {
if ( ! empty( $parent_class ) ) {
trigger_error( sprintf( ‘The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.’,
$class, $parent_class, $version, ‘<pre>__construct()</pre>’ ) );
} else {
trigger_error( sprintf( ‘The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’,
$class, $version, ‘<pre>__construct()</pre>’ ) );
}
}
}

}

/**
* Mark a file as deprecated and inform when it has been used.
*
* There is a hook {@see ‘deprecated_file_included’} that will be called that can be used
* to get the backtrace up to what file and function included the deprecated
* file.
*
* The current behavior is to trigger a user error if WP_DEBUG is true.
*
* This function is to be used in every file that is deprecated.
*
* @since 2.5.0
* @access private
*
* @param string $file The file that was included.
* @param string $version The version of WordPress that deprecated the file.
* @param string $replacement Optional. The file that should have been included based on ABSPATH.
* Default null.
* @param string $message Optional. A message regarding the change. Default empty.
*/
function _deprecated_file( $file, $version, $replacement = null, $message = ” ) {

/**
* Fires when a deprecated file is called.
*
* @since 2.5.0
*
* @param string $file The file that was called.
* @param string $replacement The file that should have been included based on ABSPATH.
* @param string $version The version of WordPress that deprecated the file.
* @param string $message A message regarding the change.
*/
do_action( ‘deprecated_file_included’, $file, $replacement, $version, $message );

/**
* Filters whether to trigger an error for deprecated files.
*
* @since 2.5.0
*
* @param bool $trigger Whether to trigger the error for deprecated files. Default true.
*/
if ( WP_DEBUG && apply_filters( ‘deprecated_file_trigger_error’, true ) ) {
$message = empty( $message ) ? ” : ‘ ‘ . $message;
if ( function_exists( ‘__’ ) ) {
if ( ! is_null( $replacement ) )
trigger_error( sprintf( __(‘%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’), $file, $version, $replacement ) . $message );
else
trigger_error( sprintf( __(‘%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.’), $file, $version ) . $message );
} else {
if ( ! is_null( $replacement ) )
trigger_error( sprintf( ‘%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’, $file, $version, $replacement ) . $message );
else
trigger_error( sprintf( ‘%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.’, $file, $version ) . $message );
}
}
}
/**
* Mark a function argument as deprecated and inform when it has been used.
*
* This function is to be used whenever a deprecated function argument is used.
* Before this function is called, the argument must be checked for whether it was
* used by comparing it to its default value or evaluating whether it is empty.
* For example:
*
* if ( ! empty( $deprecated ) ) {
* _deprecated_argument( __FUNCTION__, ‘3.0.0’ );
* }
*
*
* There is a hook deprecated_argument_run that will be called that can be used
* to get the backtrace up to what file and function used the deprecated
* argument.
*
* The current behavior is to trigger a user error if WP_DEBUG is true.
*
* @since 3.0.0
* @access private
*
* @param string $function The function that was called.
* @param string $version The version of WordPress that deprecated the argument used.
* @param string $message Optional. A message regarding the change. Default null.
*/
function _deprecated_argument( $function, $version, $message = null ) {

/**
* Fires when a deprecated argument is called.
*
* @since 3.0.0
*
* @param string $function The function that was called.
* @param string $message A message regarding the change.
* @param string $version The version of WordPress that deprecated the argument used.
*/
do_action( ‘deprecated_argument_run’, $function, $message, $version );

/**
* Filters whether to trigger an error for deprecated arguments.
*
* @since 3.0.0
*
* @param bool $trigger Whether to trigger the error for deprecated arguments. Default true.
*/
if ( WP_DEBUG && apply_filters( ‘deprecated_argument_trigger_error’, true ) ) {
if ( function_exists( ‘__’ ) ) {
if ( ! is_null( $message ) )
trigger_error( sprintf( __(‘%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s’), $function, $version, $message ) );
else
trigger_error( sprintf( __(‘%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.’), $function, $version ) );
} else {
if ( ! is_null( $message ) )
trigger_error( sprintf( ‘%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s’, $function, $version, $message ) );
else
trigger_error( sprintf( ‘%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.’, $function, $version ) );
}
}
}

/**
* Marks a deprecated action or filter hook as deprecated and throws a notice.
*
* Use the {@see ‘deprecated_hook_run’} action to get the backtrace describing where
* the deprecated hook was called.
*
* Default behavior is to trigger a user error if WP_DEBUG is true.
*
* This function is called by the do_action_deprecated() and apply_filters_deprecated()
* functions, and so generally does not need to be called directly.
*
* @since 4.6.0
* @access private
*
* @param string $hook The hook that was used.
* @param string $version The version of WordPress that deprecated the hook.
* @param string $replacement Optional. The hook that should have been used.
* @param string $message Optional. A message regarding the change.
*/
function _deprecated_hook( $hook, $version, $replacement = null, $message = null ) {
/**
* Fires when a deprecated hook is called.
*
* @since 4.6.0
*
* @param string $hook The hook that was called.
* @param string $replacement The hook that should be used as a replacement.
* @param string $version The version of WordPress that deprecated the argument used.
* @param string $message A message regarding the change.
*/
do_action( ‘deprecated_hook_run’, $hook, $replacement, $version, $message );

/**
* Filters whether to trigger deprecated hook errors.
*
* @since 4.6.0
*
* @param bool $trigger Whether to trigger deprecated hook errors. Requires
* WP_DEBUG to be defined true.
*/
if ( WP_DEBUG && apply_filters( ‘deprecated_hook_trigger_error’, true ) ) {
$message = empty( $message ) ? ” : ‘ ‘ . $message;
if ( ! is_null( $replacement ) ) {
trigger_error( sprintf( __( ‘%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.’ ), $hook, $version, $replacement ) . $message );
} else {
trigger_error( sprintf( __( ‘%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.’ ), $hook, $version ) . $message );
}
}
}

/**
* Mark something as being incorrectly called.
*
* There is a hook {@see ‘doing_it_wrong_run’} that will be called that can be used
* to get the backtrace up to what file and function called the deprecated
* function.
*
* The current behavior is to trigger a user error if WP_DEBUG is true.
*
* @since 3.1.0
* @access private
*
* @param string $function The function that was called.
* @param string $message A message explaining what has been done incorrectly.
* @param string $version The version of WordPress where the message was added.
*/
function _doing_it_wrong( $function, $message, $version ) {

/**
* Fires when the given function is being used incorrectly.
*
* @since 3.1.0
*
* @param string $function The function that was called.
* @param string $message A message explaining what has been done incorrectly.
* @param string $version The version of WordPress where the message was added.
*/
do_action( ‘doing_it_wrong_run’, $function, $message, $version );

/**
* Filters whether to trigger an error for _doing_it_wrong() calls.
*
* @since 3.1.0
*
* @param bool $trigger Whether to trigger the error for _doing_it_wrong() calls. Default true.
*/
if ( WP_DEBUG && apply_filters( ‘doing_it_wrong_trigger_error’, true ) ) {
if ( function_exists( ‘__’ ) ) {
$version = is_null( $version ) ? ” : sprintf( __( ‘(This message was added in version %s.)’ ), $version );
/* translators: %s: Codex URL */
$message .= ‘ ‘ . sprintf( __( ‘Please see <a href=”%s”>Debugging in WordPress</a> for more information.’ ),
__( ‘https://codex.wordpress.org/Debugging_in_WordPress’ )
);
trigger_error( sprintf( __( ‘%1$s was called <strong>incorrectly</strong>. %2$s %3$s’ ), $function, $message, $version ) );
} else {
$version = is_null( $version ) ? ” : sprintf( ‘(This message was added in version %s.)’, $version );
$message .= sprintf( ‘ Please see <a href=”%s”>Debugging in WordPress</a> for more information.’,
‘https://codex.wordpress.org/Debugging_in_WordPress’
);
trigger_error( sprintf( ‘%1$s was called <strong>incorrectly</strong>. %2$s %3$s’, $function, $message, $version ) );
}
}
}

/**
* Is the server running earlier than 1.5.0 version of lighttpd?
*
* @since 2.5.0
*
* @return bool Whether the server is running lighttpd < 1.5.0.
*/
function is_lighttpd_before_150() {
$server_parts = explode( ‘/’, isset( $_SERVER[‘SERVER_SOFTWARE’] )? $_SERVER[‘SERVER_SOFTWARE’] : ” );
$server_parts[1] = isset( $server_parts[1] )? $server_parts[1] : ”;
return ‘lighttpd’ == $server_parts[0] && -1 == version_compare( $server_parts[1], ‘1.5.0’ );
}

/**
* Does the specified module exist in the Apache config?
*
* @since 2.5.0
*
* @global bool $is_apache
*
* @param string $mod The module, e.g. mod_rewrite.
* @param bool $default Optional. The default return value if the module is not found. Default false.
* @return bool Whether the specified module is loaded.
*/
function apache_mod_loaded($mod, $default = false) {
global $is_apache;

if ( !$is_apache )
return false;

if ( function_exists( ‘apache_get_modules’ ) ) {
$mods = apache_get_modules();
if ( in_array($mod, $mods) )
return true;
} elseif ( function_exists( ‘phpinfo’ ) && false === strpos( ini_get( ‘disable_functions’ ), ‘phpinfo’ ) ) {
ob_start();
phpinfo(8);
$phpinfo = ob_get_clean();
if ( false !== strpos($phpinfo, $mod) )
return true;
}
return $default;
}

/**
* Check if IIS 7+ supports pretty permalinks.
*
* @since 2.8.0
*
* @global bool $is_iis7
*
* @return bool Whether IIS7 supports permalinks.
*/
function iis7_supports_permalinks() {
global $is_iis7;

$supports_permalinks = false;
if ( $is_iis7 ) {
/* First we check if the DOMDocument class exists. If it does not exist, then we cannot
* easily update the xml configuration file, hence we just bail out and tell user that
* pretty permalinks cannot be used.
*
* Next we check if the URL Rewrite Module 1.1 is loaded and enabled for the web site. When
* URL Rewrite 1.1 is loaded it always sets a server variable called ‘IIS_UrlRewriteModule’.
* Lastly we make sure that PHP is running via FastCGI. This is important because if it runs
* via ISAPI then pretty permalinks will not work.
*/
$supports_permalinks = class_exists( ‘DOMDocument’, false ) && isset($_SERVER[‘IIS_UrlRewriteModule’]) && ( PHP_SAPI == ‘cgi-fcgi’ );
}

/**
* Filters whether IIS 7+ supports pretty permalinks.
*
* @since 2.8.0
*
* @param bool $supports_permalinks Whether IIS7 supports permalinks. Default false.
*/
return apply_filters( ‘iis7_supports_permalinks’, $supports_permalinks );
}

/**
* File validates against allowed set of defined rules.
*
* A return value of ‘1’ means that the $file contains either ‘..’ or ‘./’. A
* return value of ‘2’ means that the $file contains ‘:’ after the first
* character. A return value of ‘3’ means that the file is not in the allowed
* files list.
*
* @since 1.2.0
*
* @param string $file File path.
* @param array $allowed_files List of allowed files.
* @return int 0 means nothing is wrong, greater than 0 means something was wrong.
*/
function validate_file( $file, $allowed_files = ” ) {
if ( false !== strpos( $file, ‘..’ ) )
return 1;

if ( false !== strpos( $file, ‘./’ ) )
return 1;

if ( ! empty( $allowed_files ) && ! in_array( $file, $allowed_files ) )
return 3;

if (‘:’ == substr( $file, 1, 1 ) )
return 2;

return 0;
}

/**
* Whether to force SSL used for the Administration Screens.
*
* @since 2.6.0
*
* @staticvar bool $forced
*
* @param string|bool $force Optional. Whether to force SSL in admin screens. Default null.
* @return bool True if forced, false if not forced.
*/
function force_ssl_admin( $force = null ) {
static $forced = false;

if ( !is_null( $force ) ) {
$old_forced = $forced;
$forced = $force;
return $old_forced;
}

return $forced;
}

/**
* Guess the URL for the site.
*
* Will remove wp-admin links to retrieve only return URLs not in the wp-admin
* directory.
*
* @since 2.6.0
*
* @return string The guessed URL.
*/
function wp_guess_url() {
if ( defined(‘WP_SITEURL’) && ” != WP_SITEURL ) {
$url = WP_SITEURL;
} else {
$abspath_fix = str_replace( ‘\\’, ‘/’, ABSPATH );
$script_filename_dir = dirname( $_SERVER[‘SCRIPT_FILENAME’] );

// The request is for the admin
if ( strpos( $_SERVER[‘REQUEST_URI’], ‘wp-admin’ ) !== false || strpos( $_SERVER[‘REQUEST_URI’], ‘wp-login.php’ ) !== false ) {
$path = preg_replace( ‘#/(wp-admin/.*|wp-login.php)#i’, ”, $_SERVER[‘REQUEST_URI’] );

// The request is for a file in ABSPATH
} elseif ( $script_filename_dir . ‘/’ == $abspath_fix ) {
// Strip off any file/query params in the path
$path = preg_replace( ‘#/[^/]*$#i’, ”, $_SERVER[‘PHP_SELF’] );

} else {
if ( false !== strpos( $_SERVER[‘SCRIPT_FILENAME’], $abspath_fix ) ) {
// Request is hitting a file inside ABSPATH
$directory = str_replace( ABSPATH, ”, $script_filename_dir );
// Strip off the sub directory, and any file/query params
$path = preg_replace( ‘#/’ . preg_quote( $directory, ‘#’ ) . ‘/[^/]*$#i’, ” , $_SERVER[‘REQUEST_URI’] );
} elseif ( false !== strpos( $abspath_fix, $script_filename_dir ) ) {
// Request is hitting a file above ABSPATH
$subdirectory = substr( $abspath_fix, strpos( $abspath_fix, $script_filename_dir ) + strlen( $script_filename_dir ) );
// Strip off any file/query params from the path, appending the sub directory to the install
$path = preg_replace( ‘#/[^/]*$#i’, ” , $_SERVER[‘REQUEST_URI’] ) . $subdirectory;
} else {
$path = $_SERVER[‘REQUEST_URI’];
}
}

$schema = is_ssl() ? ‘https://’ : ‘http://’; // set_url_scheme() is not defined yet
$url = $schema . $_SERVER[‘HTTP_HOST’] . $path;
}

return rtrim($url, ‘/’);
}

/**
* Temporarily suspend cache additions.
*
* Stops more data being added to the cache, but still allows cache retrieval.
* This is useful for actions, such as imports, when a lot of data would otherwise
* be almost uselessly added to the cache.
*
* Suspension lasts for a single page load at most. Remember to call this
* function again if you wish to re-enable cache adds earlier.
*
* @since 3.3.0
*
* @staticvar bool $_suspend
*
* @param bool $suspend Optional. Suspends additions if true, re-enables them if false.
* @return bool The current suspend setting
*/
function wp_suspend_cache_addition( $suspend = null ) {
static $_suspend = false;

if ( is_bool( $suspend ) )
$_suspend = $suspend;

return $_suspend;
}

/**
* Suspend cache invalidation.
*
* Turns cache invalidation on and off. Useful during imports where you don’t wont to do
* invalidations every time a post is inserted. Callers must be sure that what they are
* doing won’t lead to an inconsistent cache when invalidation is suspended.
*
* @since 2.7.0
*
* @global bool $_wp_suspend_cache_invalidation
*
* @param bool $suspend Optional. Whether to suspend or enable cache invalidation. Default true.
* @return bool The current suspend setting.
*/
function wp_suspend_cache_invalidation( $suspend = true ) {
global $_wp_suspend_cache_invalidation;

$current_suspend = $_wp_suspend_cache_invalidation;
$_wp_suspend_cache_invalidation = $suspend;
return $current_suspend;
}

/**
* Determine whether a site is the main site of the current network.
*
* @since 3.0.0
*
* @global object $current_site
*
* @param int $site_id Optional. Site ID to test. Defaults to current site.
* @return bool True if $site_id is the main site of the network, or if not
* running Multisite.
*/
function is_main_site( $site_id = null ) {
// This is the current network’s information; ‘site’ is old terminology.
global $current_site;

if ( ! is_multisite() )
return true;

if ( ! $site_id )
$site_id = get_current_blog_id();

return (int) $site_id === (int) $current_site->blog_id;
}

/**
* Determine whether a network is the main network of the Multisite install.
*
* @since 3.7.0
*
* @param int $network_id Optional. Network ID to test. Defaults to current network.
* @return bool True if $network_id is the main network, or if not running Multisite.
*/
function is_main_network( $network_id = null ) {
if ( ! is_multisite() ) {
return true;
}

$current_network_id = (int) get_current_site()->id;

if ( null === $network_id ) {
$network_id = $current_network_id;
}

$network_id = (int) $network_id;

return ( $network_id === get_main_network_id() );
}

/**
* Get the main network ID.
*
* @since 4.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return int The ID of the main network.
*/
function get_main_network_id() {
global $wpdb;

if ( ! is_multisite() ) {
return 1;
}

$current_site = get_current_site();

if ( defined( ‘PRIMARY_NETWORK_ID’ ) ) {
$main_network_id = PRIMARY_NETWORK_ID;
} elseif ( isset( $current_site->id ) && 1 === (int) $current_site->id ) {
// If the current network has an ID of 1, assume it is the main network.
$main_network_id = 1;
} else {
$main_network_id = wp_cache_get( ‘primary_network_id’, ‘site-options’ );

if ( false === $main_network_id ) {
$main_network_id = (int) $wpdb->get_var( “SELECT id FROM {$wpdb->site} ORDER BY id LIMIT 1” );
wp_cache_add( ‘primary_network_id’, $main_network_id, ‘site-options’ );
}
}

/**
* Filters the main network ID.
*
* @since 4.3.0
*
* @param int $main_network_id The ID of the main network.
*/
return (int) apply_filters( ‘get_main_network_id’, $main_network_id );
}

/**
* Determine whether global terms are enabled.
*
* @since 3.0.0
*
* @staticvar bool $global_terms
*
* @return bool True if multisite and global terms enabled.
*/
function global_terms_enabled() {
if ( ! is_multisite() )
return false;

static $global_terms = null;
if ( is_null( $global_terms ) ) {

/**
* Filters whether global terms are enabled.
*
* Passing a non-null value to the filter will effectively short-circuit the function,
* returning the value of the ‘global_terms_enabled’ site option instead.
*
* @since 3.0.0
*
* @param null $enabled Whether global terms are enabled.
*/
$filter = apply_filters( ‘global_terms_enabled’, null );
if ( ! is_null( $filter ) )
$global_terms = (bool) $filter;
else
$global_terms = (bool) get_site_option( ‘global_terms_enabled’, false );
}
return $global_terms;
}

/**
* gmt_offset modification for smart timezone handling.
*
* Overrides the gmt_offset option if we have a timezone_string available.
*
* @since 2.8.0
*
* @return float|false Timezone GMT offset, false otherwise.
*/
function wp_timezone_override_offset() {
if ( !$timezone_string = get_option( ‘timezone_string’ ) ) {
return false;
}

$timezone_object = timezone_open( $timezone_string );
$datetime_object = date_create();
if ( false === $timezone_object || false === $datetime_object ) {
return false;
}
return round( timezone_offset_get( $timezone_object, $datetime_object ) / HOUR_IN_SECONDS, 2 );
}

/**
* Sort-helper for timezones.
*
* @since 2.9.0
* @access private
*
* @param array $a
* @param array $b
* @return int
*/
function _wp_timezone_choice_usort_callback( $a, $b ) {
// Don’t use translated versions of Etc
if ( ‘Etc’ === $a[‘continent’] && ‘Etc’ === $b[‘continent’] ) {
// Make the order of these more like the old dropdown
if ( ‘GMT+’ === substr( $a[‘city’], 0, 4 ) && ‘GMT+’ === substr( $b[‘city’], 0, 4 ) ) {
return -1 * ( strnatcasecmp( $a[‘city’], $b[‘city’] ) );
}
if ( ‘UTC’ === $a[‘city’] ) {
if ( ‘GMT+’ === substr( $b[‘city’], 0, 4 ) ) {
return 1;
}
return -1;
}
if ( ‘UTC’ === $b[‘city’] ) {
if ( ‘GMT+’ === substr( $a[‘city’], 0, 4 ) ) {
return -1;
}
return 1;
}
return strnatcasecmp( $a[‘city’], $b[‘city’] );
}
if ( $a[‘t_continent’] == $b[‘t_continent’] ) {
if ( $a[‘t_city’] == $b[‘t_city’] ) {
return strnatcasecmp( $a[‘t_subcity’], $b[‘t_subcity’] );
}
return strnatcasecmp( $a[‘t_city’], $b[‘t_city’] );
} else {
// Force Etc to the bottom of the list
if ( ‘Etc’ === $a[‘continent’] ) {
return 1;
}
if ( ‘Etc’ === $b[‘continent’] ) {
return -1;
}
return strnatcasecmp( $a[‘t_continent’], $b[‘t_continent’] );
}
}

/**
* Gives a nicely-formatted list of timezone strings.
*
* @since 2.9.0
*
* @staticvar bool $mo_loaded
*
* @param string $selected_zone Selected timezone.
* @return string
*/
function wp_timezone_choice( $selected_zone ) {
static $mo_loaded = false;

$continents = array( ‘Africa’, ‘America’, ‘Antarctica’, ‘Arctic’, ‘Asia’, ‘Atlantic’, ‘Australia’, ‘Europe’, ‘Indian’, ‘Pacific’);

// Load translations for continents and cities
if ( !$mo_loaded ) {
$locale = get_locale();
$mofile = WP_LANG_DIR . ‘/continents-cities-‘ . $locale . ‘.mo’;
load_textdomain( ‘continents-cities’, $mofile );
$mo_loaded = true;
}

$zonen = array();
foreach ( timezone_identifiers_list() as $zone ) {
$zone = explode( ‘/’, $zone );
if ( !in_array( $zone[0], $continents ) ) {
continue;
}

// This determines what gets set and translated – we don’t translate Etc/* strings here, they are done later
$exists = array(
0 => ( isset( $zone[0] ) && $zone[0] ),
1 => ( isset( $zone[1] ) && $zone[1] ),
2 => ( isset( $zone[2] ) && $zone[2] ),
);
$exists[3] = ( $exists[0] && ‘Etc’ !== $zone[0] );
$exists[4] = ( $exists[1] && $exists[3] );
$exists[5] = ( $exists[2] && $exists[3] );

$zonen[] = array(
‘continent’ => ( $exists[0] ? $zone[0] : ” ),
‘city’ => ( $exists[1] ? $zone[1] : ” ),
‘subcity’ => ( $exists[2] ? $zone[2] : ” ),
‘t_continent’ => ( $exists[3] ? translate( str_replace( ‘_’, ‘ ‘, $zone[0] ), ‘continents-cities’ ) : ” ),
‘t_city’ => ( $exists[4] ? translate( str_replace( ‘_’, ‘ ‘, $zone[1] ), ‘continents-cities’ ) : ” ),
‘t_subcity’ => ( $exists[5] ? translate( str_replace( ‘_’, ‘ ‘, $zone[2] ), ‘continents-cities’ ) : ” )
);
}
usort( $zonen, ‘_wp_timezone_choice_usort_callback’ );

$structure = array();

if ( empty( $selected_zone ) ) {
$structure[] = ‘<option selected=”selected” value=””>’ . __( ‘Select a city’ ) . ‘</option>’;
}

foreach ( $zonen as $key => $zone ) {
// Build value in an array to join later
$value = array( $zone[‘continent’] );

if ( empty( $zone[‘city’] ) ) {
// It’s at the continent level (generally won’t happen)
$display = $zone[‘t_continent’];
} else {
// It’s inside a continent group

// Continent optgroup
if ( !isset( $zonen[$key – 1] ) || $zonen[$key – 1][‘continent’] !== $zone[‘continent’] ) {
$label = $zone[‘t_continent’];
$structure[] = ‘<optgroup label=”‘. esc_attr( $label ) .'”>’;
}

// Add the city to the value
$value[] = $zone[‘city’];

$display = $zone[‘t_city’];
if ( !empty( $zone[‘subcity’] ) ) {
// Add the subcity to the value
$value[] = $zone[‘subcity’];
$display .= ‘ – ‘ . $zone[‘t_subcity’];
}
}

// Build the value
$value = join( ‘/’, $value );
$selected = ”;
if ( $value === $selected_zone ) {
$selected = ‘selected=”selected” ‘;
}
$structure[] = ‘<option ‘ . $selected . ‘value=”‘ . esc_attr( $value ) . ‘”>’ . esc_html( $display ) . “</option>”;

// Close continent optgroup
if ( !empty( $zone[‘city’] ) && ( !isset($zonen[$key + 1]) || (isset( $zonen[$key + 1] ) && $zonen[$key + 1][‘continent’] !== $zone[‘continent’]) ) ) {
$structure[] = ‘</optgroup>’;
}
}

// Do UTC
$structure[] = ‘<optgroup label=”‘. esc_attr__( ‘UTC’ ) .'”>’;
$selected = ”;
if ( ‘UTC’ === $selected_zone )
$selected = ‘selected=”selected” ‘;
$structure[] = ‘<option ‘ . $selected . ‘value=”‘ . esc_attr( ‘UTC’ ) . ‘”>’ . __(‘UTC’) . ‘</option>’;
$structure[] = ‘</optgroup>’;

// Do manual UTC offsets
$structure[] = ‘<optgroup label=”‘. esc_attr__( ‘Manual Offsets’ ) .'”>’;
$offset_range = array (-12, -11.5, -11, -10.5, -10, -9.5, -9, -8.5, -8, -7.5, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5,
0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
foreach ( $offset_range as $offset ) {
if ( 0 <= $offset )
$offset_name = ‘+’ . $offset;
else
$offset_name = (string) $offset;

$offset_value = $offset_name;
$offset_name = str_replace(array(‘.25′,’.5′,’.75′), array(‘:15′,’:30′,’:45′), $offset_name);
$offset_name = ‘UTC’ . $offset_name;
$offset_value = ‘UTC’ . $offset_value;
$selected = ”;
if ( $offset_value === $selected_zone )
$selected = ‘selected=”selected” ‘;
$structure[] = ‘<option ‘ . $selected . ‘value=”‘ . esc_attr( $offset_value ) . ‘”>’ . esc_html( $offset_name ) . “</option>”;

}
$structure[] = ‘</optgroup>’;

return join( “\n”, $structure );
}

/**
* Strip close comment and close php tags from file headers used by WP.
*
* @since 2.8.0
* @access private
*
* @see https://core.trac.wordpress.org/ticket/8497
*
* @param string $str Header comment to clean up.
* @return string
*/
function _cleanup_header_comment( $str ) {
return trim(preg_replace(“/\s*(?:\*\/|\?>).*/”, ”, $str));
}

/**
* Permanently delete comments or posts of any type that have held a status
* of ‘trash’ for the number of days defined in EMPTY_TRASH_DAYS.
*
* The default value of EMPTY_TRASH_DAYS is 30 (days).
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
function wp_scheduled_delete() {
global $wpdb;

$delete_timestamp = time() – ( DAY_IN_SECONDS * EMPTY_TRASH_DAYS );

$posts_to_delete = $wpdb->get_results($wpdb->prepare(“SELECT post_id FROM $wpdb->postmeta WHERE meta_key = ‘_wp_trash_meta_time’ AND meta_value < ‘%d'”, $delete_timestamp), ARRAY_A);

foreach ( (array) $posts_to_delete as $post ) {
$post_id = (int) $post[‘post_id’];
if ( !$post_id )
continue;

$del_post = get_post($post_id);

if ( !$del_post || ‘trash’ != $del_post->post_status ) {
delete_post_meta($post_id, ‘_wp_trash_meta_status’);
delete_post_meta($post_id, ‘_wp_trash_meta_time’);
} else {
wp_delete_post($post_id);
}
}

$comments_to_delete = $wpdb->get_results($wpdb->prepare(“SELECT comment_id FROM $wpdb->commentmeta WHERE meta_key = ‘_wp_trash_meta_time’ AND meta_value < ‘%d'”, $delete_timestamp), ARRAY_A);

foreach ( (array) $comments_to_delete as $comment ) {
$comment_id = (int) $comment[‘comment_id’];
if ( !$comment_id )
continue;

$del_comment = get_comment($comment_id);

if ( !$del_comment || ‘trash’ != $del_comment->comment_approved ) {
delete_comment_meta($comment_id, ‘_wp_trash_meta_time’);
delete_comment_meta($comment_id, ‘_wp_trash_meta_status’);
} else {
wp_delete_comment( $del_comment );
}
}
}

/**
* Retrieve metadata from a file.
*
* Searches for metadata in the first 8kiB of a file, such as a plugin or theme.
* Each piece of metadata must be on its own line. Fields can not span multiple
* lines, the value will get cut at the end of the first line.
*
* If the file data is not within that first 8kiB, then the author should correct
* their plugin file and move the data headers to the top.
*
* @link https://codex.wordpress.org/File_Header
*
* @since 2.9.0
*
* @param string $file Path to the file.
* @param array $default_headers List of headers, in the format array(‘HeaderKey’ => ‘Header Name’).
* @param string $context Optional. If specified adds filter hook {@see ‘extra_$context_headers’}.
* Default empty.
* @return array Array of file headers in HeaderKey => Header Value format.
*/
function get_file_data( $file, $default_headers, $context = ” ) {
// We don’t need to write to the file, so just open for reading.
$fp = fopen( $file, ‘r’ );

// Pull only the first 8kiB of the file in.
$file_data = fread( $fp, 8192 );

// PHP will close file handle, but we are good citizens.
fclose( $fp );

// Make sure we catch CR-only line endings.
$file_data = str_replace( “\r”, “\n”, $file_data );

/**
* Filters extra file headers by context.
*
* The dynamic portion of the hook name, $context, refers to
* the context where extra headers might be loaded.
*
* @since 2.9.0
*
* @param array $extra_context_headers Empty array by default.
*/
if ( $context && $extra_headers = apply_filters( “extra_{$context}_headers”, array() ) ) {
$extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values
$all_headers = array_merge( $extra_headers, (array) $default_headers );
} else {
$all_headers = $default_headers;
}

foreach ( $all_headers as $field => $regex ) {
if ( preg_match( ‘/^[ \t\/*#@]*’ . preg_quote( $regex, ‘/’ ) . ‘:(.*)$/mi’, $file_data, $match ) && $match[1] )
$all_headers[ $field ] = _cleanup_header_comment( $match[1] );
else
$all_headers[ $field ] = ”;
}

return $all_headers;
}

/**
* Returns true.
*
* Useful for returning true to filters easily.
*
* @since 3.0.0
*
* @see __return_false()
*
* @return true True.
*/
function __return_true() {
return true;
}

/**
* Returns false.
*
* Useful for returning false to filters easily.
*
* @since 3.0.0
*
* @see __return_true()
*
* @return false False.
*/
function __return_false() {
return false;
}

/**
* Returns 0.
*
* Useful for returning 0 to filters easily.
*
* @since 3.0.0
*
* @return int 0.
*/
function __return_zero() {
return 0;
}

/**
* Returns an empty array.
*
* Useful for returning an empty array to filters easily.
*
* @since 3.0.0
*
* @return array Empty array.
*/
function __return_empty_array() {
return array();
}

/**
* Returns null.
*
* Useful for returning null to filters easily.
*
* @since 3.4.0
*
* @return null Null value.
*/
function __return_null() {
return null;
}

/**
* Returns an empty string.
*
* Useful for returning an empty string to filters easily.
*
* @since 3.7.0
*
* @see __return_null()
*
* @return string Empty string.
*/
function __return_empty_string() {
return ”;
}

/**
* Send a HTTP header to disable content type sniffing in browsers which support it.
*
* @since 3.0.0
*
* @see https://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx
* @see https://src.chromium.org/viewvc/chrome?view=rev&revision=6985
*/
function send_nosniff_header() {
@header( ‘X-Content-Type-Options: nosniff’ );
}

/**
* Return a MySQL expression for selecting the week number based on the start_of_week option.
*
* @ignore
* @since 3.0.0
*
* @param string $column Database column.
* @return string SQL clause.
*/
function _wp_mysql_week( $column ) {
switch ( $start_of_week = (int) get_option( ‘start_of_week’ ) ) {
case 1 :
return “WEEK( $column, 1 )”;
case 2 :
case 3 :
case 4 :
case 5 :
case 6 :
return “WEEK( DATE_SUB( $column, INTERVAL $start_of_week DAY ), 0 )”;
case 0 :
default :
return “WEEK( $column, 0 )”;
}
}

/**
* Find hierarchy loops using a callback function that maps object IDs to parent IDs.
*
* @since 3.1.0
* @access private
*
* @param callable $callback Function that accepts ( ID, $callback_args ) and outputs parent_ID.
* @param int $start The ID to start the loop check at.
* @param int $start_parent The parent_ID of $start to use instead of calling $callback( $start ).
* Use null to always use $callback
* @param array $callback_args Optional. Additional arguments to send to $callback.
* @return array IDs of all members of loop.
*/
function wp_find_hierarchy_loop( $callback, $start, $start_parent, $callback_args = array() ) {
$override = is_null( $start_parent ) ? array() : array( $start => $start_parent );

if ( !$arbitrary_loop_member = wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override, $callback_args ) )
return array();

return wp_find_hierarchy_loop_tortoise_hare( $callback, $arbitrary_loop_member, $override, $callback_args, true );
}

/**
* Use the “The Tortoise and the Hare” algorithm to detect loops.
*
* For every step of the algorithm, the hare takes two steps and the tortoise one.
* If the hare ever laps the tortoise, there must be a loop.
*
* @since 3.1.0
* @access private
*
* @param callable $callback Function that accepts ( ID, callback_arg, … ) and outputs parent_ID.
* @param int $start The ID to start the loop check at.
* @param array $override Optional. An array of ( ID => parent_ID, … ) to use instead of $callback.
* Default empty array.
* @param array $callback_args Optional. Additional arguments to send to $callback. Default empty array.
* @param bool $_return_loop Optional. Return loop members or just detect presence of loop? Only set
* to true if you already know the given $start is part of a loop (otherwise
* the returned array might include branches). Default false.
* @return mixed Scalar ID of some arbitrary member of the loop, or array of IDs of all members of loop if
* $_return_loop
*/
function wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override = array(), $callback_args = array(), $_return_loop = false ) {
$tortoise = $hare = $evanescent_hare = $start;
$return = array();

// Set evanescent_hare to one past hare
// Increment hare two steps
while (
$tortoise
&&
( $evanescent_hare = isset( $override[$hare] ) ? $override[$hare] : call_user_func_array( $callback, array_merge( array( $hare ), $callback_args ) ) )
&&
( $hare = isset( $override[$evanescent_hare] ) ? $override[$evanescent_hare] : call_user_func_array( $callback, array_merge( array( $evanescent_hare ), $callback_args ) ) )
) {
if ( $_return_loop )
$return[$tortoise] = $return[$evanescent_hare] = $return[$hare] = true;

// tortoise got lapped – must be a loop
if ( $tortoise == $evanescent_hare || $tortoise == $hare )
return $_return_loop ? $return : $tortoise;

// Increment tortoise by one step
$tortoise = isset( $override[$tortoise] ) ? $override[$tortoise] : call_user_func_array( $callback, array_merge( array( $tortoise ), $callback_args ) );
}

return false;
}

/**
* Send a HTTP header to limit rendering of pages to same origin iframes.
*
* @since 3.1.3
*
* @see https://developer.mozilla.org/en/the_x-frame-options_response_header
*/
function send_frame_options_header() {
@header( ‘X-Frame-Options: SAMEORIGIN’ );
}

/**
* Retrieve a list of protocols to allow in HTML attributes.
*
* @since 3.3.0
* @since 4.3.0 Added ‘webcal’ to the protocols array.
*
* @see wp_kses()
* @see esc_url()
*
* @staticvar array $protocols
*
* @return array Array of allowed protocols. Defaults to an array containing ‘http’, ‘https’,
* ‘ftp’, ‘ftps’, ‘mailto’, ‘news’, ‘irc’, ‘gopher’, ‘nntp’, ‘feed’, ‘telnet’,
* ‘mms’, ‘rtsp’, ‘svn’, ‘tel’, ‘fax’, ‘xmpp’, and ‘webcal’.
*/
function wp_allowed_protocols() {
static $protocols = array();

if ( empty( $protocols ) ) {
$protocols = array( ‘http’, ‘https’, ‘ftp’, ‘ftps’, ‘mailto’, ‘news’, ‘irc’, ‘gopher’, ‘nntp’, ‘feed’, ‘telnet’, ‘mms’, ‘rtsp’, ‘svn’, ‘tel’, ‘fax’, ‘xmpp’, ‘webcal’ );

/**
* Filters the list of protocols allowed in HTML attributes.
*
* @since 3.0.0
*
* @param array $protocols Array of allowed protocols e.g. ‘http’, ‘ftp’, ‘tel’, and more.
*/
$protocols = apply_filters( ‘kses_allowed_protocols’, $protocols );
}

return $protocols;
}

/**
* Return a comma-separated string of functions that have been called to get
* to the current point in code.
*
* @since 3.4.0
*
* @see https://core.trac.wordpress.org/ticket/19589
*
* @param string $ignore_class Optional. A class to ignore all function calls within – useful
* when you want to just give info about the callee. Default null.
* @param int $skip_frames Optional. A number of stack frames to skip – useful for unwinding
* back to the source of the issue. Default 0.
* @param bool $pretty Optional. Whether or not you want a comma separated string or raw
* array returned. Default true.
* @return string|array Either a string containing a reversed comma separated trace or an array
* of individual calls.
*/
function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pretty = true ) {
if ( version_compare( PHP_VERSION, ‘5.2.5’, ‘>=’ ) )
$trace = debug_backtrace( false );
else
$trace = debug_backtrace();

$caller = array();
$check_class = ! is_null( $ignore_class );
$skip_frames++; // skip this function

foreach ( $trace as $call ) {
if ( $skip_frames > 0 ) {
$skip_frames–;
} elseif ( isset( $call[‘class’] ) ) {
if ( $check_class && $ignore_class == $call[‘class’] )
continue; // Filter out calls

$caller[] = “{$call[‘class’]}{$call[‘type’]}{$call[‘function’]}”;
} else {
if ( in_array( $call[‘function’], array( ‘do_action’, ‘apply_filters’ ) ) ) {
$caller[] = “{$call[‘function’]}(‘{$call[‘args’][0]}’)”;
} elseif ( in_array( $call[‘function’], array( ‘include’, ‘include_once’, ‘require’, ‘require_once’ ) ) ) {
$caller[] = $call[‘function’] . “(‘” . str_replace( array( WP_CONTENT_DIR, ABSPATH ) , ”, $call[‘args’][0] ) . “‘)”;
} else {
$caller[] = $call[‘function’];
}
}
}
if ( $pretty )
return join( ‘, ‘, array_reverse( $caller ) );
else
return $caller;
}

/**
* Retrieve ids that are not already present in the cache.
*
* @since 3.4.0
* @access private
*
* @param array $object_ids ID list.
* @param string $cache_key The cache bucket to check against.
*
* @return array List of ids not present in the cache.
*/
function _get_non_cached_ids( $object_ids, $cache_key ) {
$clean = array();
foreach ( $object_ids as $id ) {
$id = (int) $id;
if ( !wp_cache_get( $id, $cache_key ) ) {
$clean[] = $id;
}
}

return $clean;
}

/**
* Test if the current device has the capability to upload files.
*
* @since 3.4.0
* @access private
*
* @return bool Whether the device is able to upload files.
*/
function _device_can_upload() {
if ( ! wp_is_mobile() )
return true;

$ua = $_SERVER[‘HTTP_USER_AGENT’];

if ( strpos($ua, ‘iPhone’) !== false
|| strpos($ua, ‘iPad’) !== false
|| strpos($ua, ‘iPod’) !== false ) {
return preg_match( ‘#OS ([\d_]+) like Mac OS X#’, $ua, $version ) && version_compare( $version[1], ‘6’, ‘>=’ );
}

return true;
}

/**
* Test if a given path is a stream URL
*
* @param string $path The resource path or URL.
* @return bool True if the path is a stream URL.
*/
function wp_is_stream( $path ) {
$wrappers = stream_get_wrappers();
$wrappers_re = ‘(‘ . join(‘|’, $wrappers) . ‘)’;

return preg_match( “!^$wrappers_re://!”, $path ) === 1;
}

/**
* Test if the supplied date is valid for the Gregorian calendar.
*
* @since 3.5.0
*
* @see checkdate()
*
* @param int $month Month number.
* @param int $day Day number.
* @param int $year Year number.
* @param string $source_date The date to filter.
* @return bool True if valid date, false if not valid date.
*/
function wp_checkdate( $month, $day, $year, $source_date ) {
/**
* Filters whether the given date is valid for the Gregorian calendar.
*
* @since 3.5.0
*
* @param bool $checkdate Whether the given date is valid.
* @param string $source_date Date to check.
*/
return apply_filters( ‘wp_checkdate’, checkdate( $month, $day, $year ), $source_date );
}

/**
* Load the auth check for monitoring whether the user is still logged in.
*
* Can be disabled with remove_action( ‘admin_enqueue_scripts’, ‘wp_auth_check_load’ );
*
* This is disabled for certain screens where a login screen could cause an
* inconvenient interruption. A filter called {@see ‘wp_auth_check_load’} can be used
* for fine-grained control.
*
* @since 3.6.0
*/
function wp_auth_check_load() {
if ( ! is_admin() && ! is_user_logged_in() )
return;

if ( defined( ‘IFRAME_REQUEST’ ) )
return;

$screen = get_current_screen();
$hidden = array( ‘update’, ‘update-network’, ‘update-core’, ‘update-core-network’, ‘upgrade’, ‘upgrade-network’, ‘network’ );
$show = ! in_array( $screen->id, $hidden );

/**
* Filters whether to load the authentication check.
*
* Passing a falsey value to the filter will effectively short-circuit
* loading the authentication check.
*
* @since 3.6.0
*
* @param bool $show Whether to load the authentication check.
* @param WP_Screen $screen The current screen object.
*/
if ( apply_filters( ‘wp_auth_check_load’, $show, $screen ) ) {
wp_enqueue_style( ‘wp-auth-check’ );
wp_enqueue_script( ‘wp-auth-check’ );

add_action( ‘admin_print_footer_scripts’, ‘wp_auth_check_html’, 5 );
add_action( ‘wp_print_footer_scripts’, ‘wp_auth_check_html’, 5 );
}
}

/**
* Output the HTML that shows the wp-login dialog when the user is no longer logged in.
*
* @since 3.6.0
*/
function wp_auth_check_html() {
$login_url = wp_login_url();
$current_domain = ( is_ssl() ? ‘https://’ : ‘http://’ ) . $_SERVER[‘HTTP_HOST’];
$same_domain = ( strpos( $login_url, $current_domain ) === 0 );

/**
* Filters whether the authentication check originated at the same domain.
*
* @since 3.6.0
*
* @param bool $same_domain Whether the authentication check originated at the same domain.
*/
$same_domain = apply_filters( ‘wp_auth_check_same_domain’, $same_domain );
$wrap_class = $same_domain ? ‘hidden’ : ‘hidden fallback’;

?>
<div id=”wp-auth-check-wrap” class=”<?php echo $wrap_class; ?>”>
<div id=”wp-auth-check-bg”></div>
<div id=”wp-auth-check”>
<button type=”button” class=”wp-auth-check-close button-link”><span class=”screen-reader-text”><?php _e( ‘Close dialog’ ); ?></span></button>
<?php

if ( $same_domain ) {
?>
<div id=”wp-auth-check-form” class=”loading” data-src=”<?php echo esc_url( add_query_arg( array( ‘interim-login’ => 1 ), $login_url ) ); ?>”></div>
<?php
}

?>
<div class=”wp-auth-fallback”>
<p><b class=”wp-auth-fallback-expired” tabindex=”0″><?php _e(‘Session expired’); ?></b></p>
<p><a href=”<?php echo esc_url( $login_url ); ?>” target=”_blank”><?php _e(‘Please log in again.’); ?></a>
<?php _e(‘The login page will open in a new window. After logging in you can close it and return to this page.’); ?></p>
</div>
</div>
</div>
<?php
}

/**
* Check whether a user is still logged in, for the heartbeat.
*
* Send a result that shows a log-in box if the user is no longer logged in,
* or if their cookie is within the grace period.
*
* @since 3.6.0
*
* @global int $login_grace_period
*
* @param array $response The Heartbeat response.
* @return array $response The Heartbeat response with ‘wp-auth-check’ value set.
*/
function wp_auth_check( $response ) {
$response[‘wp-auth-check’] = is_user_logged_in() && empty( $GLOBALS[‘login_grace_period’] );
return $response;
}

/**
* Return RegEx body to liberally match an opening HTML tag.
*
* Matches an opening HTML tag that:
* 1. Is self-closing or
* 2. Has no body but has a closing tag of the same name or
* 3. Contains a body and a closing tag of the same name
*
* Note: this RegEx does not balance inner tags and does not attempt
* to produce valid HTML
*
* @since 3.6.0
*
* @param string $tag An HTML tag name. Example: ‘video’.
* @return string Tag RegEx.
*/
function get_tag_regex( $tag ) {
if ( empty( $tag ) )
return;
return sprintf( ‘<%1$s[^<]*(?:>[\s\S]*<\/%1$s>|\s*\/>)’, tag_escape( $tag ) );
}

/**
* Retrieve a canonical form of the provided charset appropriate for passing to PHP
* functions such as htmlspecialchars() and charset html attributes.
*
* @since 3.6.0
* @access private
*
* @see https://core.trac.wordpress.org/ticket/23688
*
* @param string $charset A charset name.
* @return string The canonical form of the charset.
*/
function _canonical_charset( $charset ) {
if ( ‘UTF-8’ === $charset || ‘utf-8’ === $charset || ‘utf8’ === $charset ||
‘UTF8’ === $charset )
return ‘UTF-8’;

if ( ‘ISO-8859-1’ === $charset || ‘iso-8859-1’ === $charset ||
‘iso8859-1’ === $charset || ‘ISO8859-1’ === $charset )
return ‘ISO-8859-1’;

return $charset;
}

/**
* Set the mbstring internal encoding to a binary safe encoding when func_overload
* is enabled.
*
* When mbstring.func_overload is in use for multi-byte encodings, the results from
* strlen() and similar functions respect the utf8 characters, causing binary data
* to return incorrect lengths.
*
* This function overrides the mbstring encoding to a binary-safe encoding, and
* resets it to the users expected encoding afterwards through the
* reset_mbstring_encoding function.
*
* It is safe to recursively call this function, however each
* mbstring_binary_safe_encoding() call must be followed up with an equal number
* of reset_mbstring_encoding() calls.
*
* @since 3.7.0
*
* @see reset_mbstring_encoding()
*
* @staticvar array $encodings
* @staticvar bool $overloaded
*
* @param bool $reset Optional. Whether to reset the encoding back to a previously-set encoding.
* Default false.
*/
function mbstring_binary_safe_encoding( $reset = false ) {
static $encodings = array();
static $overloaded = null;

if ( is_null( $overloaded ) )
$overloaded = function_exists( ‘mb_internal_encoding’ ) && ( ini_get( ‘mbstring.func_overload’ ) & 2 );

if ( false === $overloaded )
return;

if ( ! $reset ) {
$encoding = mb_internal_encoding();
array_push( $encodings, $encoding );
mb_internal_encoding( ‘ISO-8859-1’ );
}

if ( $reset && $encodings ) {
$encoding = array_pop( $encodings );
mb_internal_encoding( $encoding );
}
}

/**
* Reset the mbstring internal encoding to a users previously set encoding.
*
* @see mbstring_binary_safe_encoding()
*
* @since 3.7.0
*/
function reset_mbstring_encoding() {
mbstring_binary_safe_encoding( true );
}

/**
* Filter/validate a variable as a boolean.
*
* Alternative to filter_var( $var, FILTER_VALIDATE_BOOLEAN ).
*
* @since 4.0.0
*
* @param mixed $var Boolean value to validate.
* @return bool Whether the value is validated.
*/
function wp_validate_boolean( $var ) {
if ( is_bool( $var ) ) {
return $var;
}

if ( is_string( $var ) && ‘false’ === strtolower( $var ) ) {
return false;
}

return (bool) $var;
}

/**
* Delete a file
*
* @since 4.2.0
*
* @param string $file The path to the file to delete.
*/
function wp_delete_file( $file ) {
/**
* Filters the path of the file to delete.
*
* @since 2.1.0
*
* @param string $medium Path to the file to delete.
*/
$delete = apply_filters( ‘wp_delete_file’, $file );
if ( ! empty( $delete ) ) {
@unlink( $delete );
}
}

/**
* Outputs a small JS snippet on preview tabs/windows to remove window.name on unload.
*
* This prevents reusing the same tab for a preview when the user has navigated away.
*
* @since 4.3.0
*/
function wp_post_preview_js() {
global $post;

if ( ! is_preview() || empty( $post ) ) {
return;
}

// Has to match the window name used in post_submit_meta_box()
$name = ‘wp-preview-‘ . (int) $post->ID;

?>
<script>
( function() {
var query = document.location.search;

if ( query && query.indexOf( ‘preview=true’ ) !== -1 ) {
window.name = ‘<?php echo $name; ?>’;
}

if ( window.addEventListener ) {
window.addEventListener( ‘unload’, function() { window.name = ”; }, false );
}
}());
</script>
<?php
}

/**
* Parses and formats a MySQL datetime (Y-m-d H:i:s) for ISO8601/RFC3339.
*
* Explicitly strips timezones, as datetimes are not saved with any timezone
* information. Including any information on the offset could be misleading.
*
* @since 4.4.0
*
* @param string $date_string Date string to parse and format.
* @return string Date formatted for ISO8601/RFC3339.
*/
function mysql_to_rfc3339( $date_string ) {
$formatted = mysql2date( ‘c’, $date_string, false );

// Strip timezone information
return preg_replace( ‘/(?:Z|[+-]\d{2}(?::\d{2})?)$/’, ”, $formatted );
}

/**
* Attempts to raise the PHP memory limit for memory intensive processes.
*
* Only allows raising the existing limit and prevents lowering it.
*
* @since 4.6.0
*
* @param string $context Optional. Context in which the function is called. Accepts either ‘admin’,
* ‘image’, or an arbitrary other context. If an arbitrary context is passed,
* the similarly arbitrary {@see ‘{$context}_memory_limit’} filter will be
* invoked. Default ‘admin’.
* @return bool|int|string The limit that was set or false on failure.
*/
function wp_raise_memory_limit( $context = ‘admin’ ) {
// Exit early if the limit cannot be changed.
if ( false === wp_is_ini_value_changeable( ‘memory_limit’ ) ) {
return false;
}

$current_limit = @ini_get( ‘memory_limit’ );
$current_limit_int = wp_convert_hr_to_bytes( $current_limit );

if ( -1 === $current_limit_int ) {
return false;
}

$wp_max_limit = WP_MAX_MEMORY_LIMIT;
$wp_max_limit_int = wp_convert_hr_to_bytes( $wp_max_limit );
$filtered_limit = $wp_max_limit;

switch ( $context ) {
case ‘admin’:
/**
* Filters the maximum memory limit available for administration screens.
*
* This only applies to administrators, who may require more memory for tasks
* like updates. Memory limits when processing images (uploaded or edited by
* users of any role) are handled separately.
*
* The WP_MAX_MEMORY_LIMIT constant specifically defines the maximum memory
* limit available when in the administration back end. The default is 256M
* (256 megabytes of memory) or the original memory_limit php.ini value if
* this is higher.
*
* @since 3.0.0
* @since 4.6.0 The default now takes the original memory_limit into account.
*
* @param int|string $filtered_limit The maximum WordPress memory limit. Accepts an integer
* (bytes), or a shorthand string notation, such as ‘256M’.
*/
$filtered_limit = apply_filters( ‘admin_memory_limit’, $filtered_limit );
break;

case ‘image’:
/**
* Filters the memory limit allocated for image manipulation.
*
* @since 3.5.0
* @since 4.6.0 The default now takes the original memory_limit into account.
*
* @param int|string $filtered_limit Maximum memory limit to allocate for images.
* Default WP_MAX_MEMORY_LIMIT or the original
* php.ini memory_limit, whichever is higher.
* Accepts an integer (bytes), or a shorthand string
* notation, such as ‘256M’.
*/
$filtered_limit = apply_filters( ‘image_memory_limit’, $filtered_limit );
break;

default:
/**
* Filters the memory limit allocated for arbitrary contexts.
*
* The dynamic portion of the hook name, $context, refers to an arbitrary
* context passed on calling the function. This allows for plugins to define
* their own contexts for raising the memory limit.
*
* @since 4.6.0
*
* @param int|string $filtered_limit Maximum memory limit to allocate for images.
* Default ‘256M’ or the original php.ini memory_limit,
* whichever is higher. Accepts an integer (bytes), or a
* shorthand string notation, such as ‘256M’.
*/
$filtered_limit = apply_filters( “{$context}_memory_limit”, $filtered_limit );
break;
}

$filtered_limit_int = wp_convert_hr_to_bytes( $filtered_limit );

if ( -1 === $filtered_limit_int || ( $filtered_limit_int > $wp_max_limit_int && $filtered_limit_int > $current_limit_int ) ) {
if ( false !== @ini_set( ‘memory_limit’, $filtered_limit ) ) {
return $filtered_limit;
} else {
return false;
}
} elseif ( -1 === $wp_max_limit_int || $wp_max_limit_int > $current_limit_int ) {
if ( false !== @ini_set( ‘memory_limit’, $wp_max_limit ) ) {
return $wp_max_limit;
} else {
return false;
}
}

return false;
}