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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 |
---|---|
3687 | * |
3688 | * @since 4.7.4 |
3689 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
3690 | * |
3691 | * @link https://core.trac.wordpress.org/ticket/31071 |
3692 | * |
3693 | * @param bool|null Whether to show the button, or `null` to decide based |
3694 | * on whether any video files exist in the media library. |
3695 | */ |
3696 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
3697 | if ( null === $show_video_playlist ) { |
3698 | $show_video_playlist = $wpdb->get_var( |
3699 | " |
3700 | SELECT ID |
3701 | FROM $wpdb->posts |
3702 | WHERE post_type = 'attachment' |
3703 | AND post_mime_type LIKE 'video%' |
3704 | LIMIT 1 |
3705 | " |