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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 |
|---|---|
| 4425 | * |
| 4426 | * @since 4.7.4 |
| 4427 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
| 4428 | * |
| 4429 | * @link https://core.trac.wordpress.org/ticket/31071 |
| 4430 | * |
| 4431 | * @param bool|null $show Whether to show the button, or `null` to decide based |
| 4432 | * on whether any audio files exist in the media library. |
| 4433 | */ |
| 4434 | $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true ); |
| 4435 | if ( null === $show_audio_playlist ) { |
| 4436 | $show_audio_playlist = $wpdb->get_var( |
| 4437 | " |
| 4438 | SELECT ID |
| 4439 | FROM $wpdb->posts |
| 4440 | WHERE post_type = 'attachment' |
| 4441 | AND post_mime_type LIKE 'audio%' |
| 4442 | LIMIT 1 |
| 4443 | " |