View difference between Paste ID: wHttk8UT and

-
+function add_query_arg() {
         $ret = '';
         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] );
         }
 
         $homeurl = str_replace(( is_ssl() ? 'https://' : 'http://' ), '', get_bloginfo('url'));
 
         $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;
 }