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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 |
---|---|
3378 | * |
3379 | * @since 4.7.4 |
3380 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
3381 | * |
3382 | * @link https://core.trac.wordpress.org/ticket/31071 |
3383 | * |
3384 | * @param bool|null Whether to show the button, or `null` to decide based |
3385 | * on whether any video files exist in the media library. |
3386 | */ |
3387 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
3388 | if ( null === $show_video_playlist ) { |
3389 | $show_video_playlist = $wpdb->get_var( " |
3390 | SELECT ID |
3391 | FROM $wpdb->posts |
3392 | WHERE post_type = 'attachment' |
3393 | AND post_mime_type LIKE 'video%' |
3394 | LIMIT 1 |
3395 | " ); |
3396 | } |