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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 |
---|---|
3389 | * |
3390 | * @since 4.7.4 |
3391 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
3392 | * |
3393 | * @link https://core.trac.wordpress.org/ticket/31071 |
3394 | * |
3395 | * @param bool|null Whether to show the button, or `null` to decide based |
3396 | * on whether any video files exist in the media library. |
3397 | */ |
3398 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
3399 | if ( null === $show_video_playlist ) { |
3400 | $show_video_playlist = $wpdb->get_var( " |
3401 | SELECT ID |
3402 | FROM $wpdb->posts |
3403 | WHERE post_type = 'attachment' |
3404 | AND post_mime_type LIKE 'video%' |
3405 | LIMIT 1 |
3406 | " ); |
3407 | } |