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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2527 | $mime = 0; |
| 2528 | } |
| 2529 | } else { |
| 2530 | $post_mimes[] = $mime; |
| 2531 | } |
| 2532 | |
| 2533 | $icon_files = wp_cache_get('icon_files'); |
| 2534 | |
| 2535 | if ( !is_array($icon_files) ) { |
| 2536 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' ); |
| 2537 | $icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url('images/crystal') ); |
| 2538 | $dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) ); |
| 2539 | $icon_files = array(); |
| 2540 | while ( $dirs ) { |
| 2541 | $dir = array_shift($keys = array_keys($dirs)); |
| 2542 | $uri = array_shift($dirs); |
| 2543 | if ( $dh = opendir($dir) ) { |
| 2544 | while ( false !== $file = readdir($dh) ) { |
| 2545 | $file = basename($file); |