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Understanding Source Code

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Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

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Line Code
4026                     $mime = 0;
4027                }
4028           } else {
4029                $post_mimes[] = $mime;
4030           }
4031
4032           $icon_files = wp_cache_get('icon_files');
4033
4034           if ( !is_array($icon_files) ) {
4035                $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
4036                $icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url('images/crystal') );
4037                $dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) );
4038                $icon_files = array();
4039                while ( $dirs ) {
4040                     $keys = array_keys( $dirs );
4041                     $dir = array_shift( $keys );
4042                     $uri = array_shift($dirs);
4043                     if ( $dh = opendir($dir) ) {
4044                          while ( false !== $file = readdir($dh) ) {