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The best way to understand what a hook does is to look at where it occurs in the source code.
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 |
|---|---|
| 2736 | * of the default playlist output, returning the passed value instead. |
| 2737 | * |
| 2738 | * @since 3.9.0 |
| 2739 | * @since 4.2.0 The `$instance` parameter was added. |
| 2740 | * |
| 2741 | * @param string $output Playlist output. Default empty. |
| 2742 | * @param array $attr An array of shortcode attributes. |
| 2743 | * @param int $instance Unique numeric ID of this playlist shortcode instance. |
| 2744 | */ |
| 2745 | $output = apply_filters( 'post_playlist', '', $attr, $instance ); |
| 2746 | |
| 2747 | if ( ! empty( $output ) ) { |
| 2748 | return $output; |
| 2749 | } |
| 2750 | |
| 2751 | $atts = shortcode_atts( |
| 2752 | array( |
| 2753 | 'type' => 'audio', |
| 2754 | 'order' => 'ASC', |