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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 |
|---|---|
| 2398 | } |
| 2399 | } else { |
| 2400 | $post_mimes[] = $mime; |
| 2401 | } |
| 2402 | |
| 2403 | $icon_files = wp_cache_get('icon_files'); |
| 2404 | |
| 2405 | if ( !is_array($icon_files) ) { |
| 2406 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' ); |
| 2407 | $icon_dir_uri = apply_filters( 'icon_dir_uri', trailingslashit(get_option('siteurl')) . WPINC . '/images/crystal' ); |
| 2408 | $dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) ); |
| 2409 | $icon_files = array(); |
| 2410 | while ( $dirs ) { |
| 2411 | $dir = array_shift(array_keys($dirs)); |
| 2412 | $uri = array_shift($dirs); |
| 2413 | if ( $dh = opendir($dir) ) { |
| 2414 | while ( false !== $file = readdir($dh) ) { |
| 2415 | $file = basename($file); |
| 2416 | if ( substr($file, 0, 1) == '.' ) |