function add_query_arg() {
$ret = '';
$homeurl = str_replace(( is_ssl() ? 'https://' : 'http://' ), '', get_bloginfo('url'));
if ( is_array( func_get_arg(0) ) ) {
if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
if ( get_bloginfo('url') != '' )
$uri = get_bloginfo('url') . $_SERVER['REQUEST_URI'];
else
$uri = $_SERVER['REQUEST_URI'];
else
$uri = @func_get_arg( 1 );
} else {
if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
if ( get_bloginfo('url') != '' )
$uri = get_bloginfo('url') . $_SERVER['REQUEST_URI'];
else
$uri = $_SERVER['REQUEST_URI'];
else
$uri = @func_get_arg( 2 );
}
if ( $frag = strstr( $uri, '#' ) )
$uri = substr( $uri, 0, -strlen( $frag ) );
else
$frag = '';
if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
$protocol = $matches[0];
$uri = substr( $uri, strlen( $protocol ) );
} else {
$protocol = '';
}
if ( strpos( $uri, '?' ) !== false ) {
$parts = explode( '?', $uri, 2 );
if ( 1 == count( $parts ) ) {
$base = '?';
$query = $parts[0];
} else {
$base = $parts[0] . '?';
$query = $parts[1];
}
} elseif ( !empty( $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( func_get_arg( 0 ) ) ) {
$kayvees = func_get_arg( 0 );
$qs = array_merge( $qs, $kayvees );
} else {
$qs[func_get_arg( 0 )] = func_get_arg( 1 );
}
foreach ( (array) $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, '?' );
$ret = str_replace($_SERVER['HTTP_HOST'], $homeurl, $ret);
return $ret;
}