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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 |
---|---|
3523 | * |
3524 | * @since 4.7.4 |
3525 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
3526 | * |
3527 | * @link https://core.trac.wordpress.org/ticket/31071 |
3528 | * |
3529 | * @param bool|null Whether to show the button, or `null` to decide based |
3530 | * on whether any video files exist in the media library. |
3531 | */ |
3532 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
3533 | if ( null === $show_video_playlist ) { |
3534 | $show_video_playlist = $wpdb->get_var( |
3535 | " |
3536 | SELECT ID |
3537 | FROM $wpdb->posts |
3538 | WHERE post_type = 'attachment' |
3539 | AND post_mime_type LIKE 'video%' |
3540 | LIMIT 1 |
3541 | " |