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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

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
3697                     $mime = 0;
3698                }
3699           } else {
3700                $post_mimes[] = $mime;
3701           }
3702
3703           $icon_files = wp_cache_get('icon_files');
3704
3705           if ( !is_array($icon_files) ) {
3706                $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
3707                $icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url('images/crystal') );
3708                $dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) );
3709                $icon_files = array();
3710                while ( $dirs ) {
3711                     $dir = array_shift($keys = array_keys($dirs));
3712                     $uri = array_shift($dirs);
3713                     if ( $dh = opendir($dir) ) {
3714                          while ( false !== $file = readdir($dh) ) {
3715                               $file = basename($file);