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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 |
|---|---|
| 4657 | * |
| 4658 | * @since 4.7.4 |
| 4659 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
| 4660 | * |
| 4661 | * @link https://core.trac.wordpress.org/ticket/31071 |
| 4662 | * |
| 4663 | * @param bool|null $show Whether to show the button, or `null` to decide based |
| 4664 | * on whether any video files exist in the media library. |
| 4665 | */ |
| 4666 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
| 4667 | if ( null === $show_video_playlist ) { |
| 4668 | $show_video_playlist = $wpdb->get_var( |
| 4669 | "SELECT ID |
| 4670 | FROM $wpdb->posts |
| 4671 | WHERE post_type = 'attachment' |
| 4672 | AND post_mime_type LIKE 'video%' |
| 4673 | LIMIT 1" |
| 4674 | ); |
| 4675 | } |