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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 |
|---|---|
| 4298 | * |
| 4299 | * @since 4.7.4 |
| 4300 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
| 4301 | * |
| 4302 | * @link https://core.trac.wordpress.org/ticket/31071 |
| 4303 | * |
| 4304 | * @param bool|null $show Whether to show the button, or `null` to decide based |
| 4305 | * on whether any video files exist in the media library. |
| 4306 | */ |
| 4307 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
| 4308 | if ( null === $show_video_playlist ) { |
| 4309 | $show_video_playlist = $wpdb->get_var( |
| 4310 | " |
| 4311 | SELECT ID |
| 4312 | FROM $wpdb->posts |
| 4313 | WHERE post_type = 'attachment' |
| 4314 | AND post_mime_type LIKE 'video%' |
| 4315 | LIMIT 1 |
| 4316 | " |