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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
2807                     $mime = 0;
2808                }
2809           } else {
2810                $post_mimes[] = $mime;
2811           }
2812
2813           $icon_files = wp_cache_get('icon_files');
2814
2815           if ( !is_array($icon_files) ) {
2816                $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
2817                $icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url('images/crystal') );
2818                $dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) );
2819                $icon_files = array();
2820                while ( $dirs ) {
2821                     $dir = array_shift($keys = array_keys($dirs));
2822                     $uri = array_shift($dirs);
2823                     if ( $dh = opendir($dir) ) {
2824                          while ( false !== $file = readdir($dh) ) {
2825                               $file = basename($file);