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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 |
---|---|
2537 | * of the default playlist output, returning the passed value instead. |
2538 | * |
2539 | * @since 3.9.0 |
2540 | * @since 4.2.0 The `$instance` parameter was added. |
2541 | * |
2542 | * @param string $output Playlist output. Default empty. |
2543 | * @param array $attr An array of shortcode attributes. |
2544 | * @param int $instance Unique numeric ID of this playlist shortcode instance. |
2545 | */ |
2546 | $output = apply_filters( 'post_playlist', '', $attr, $instance ); |
2547 |
|
2548 | if ( ! empty( $output ) ) { |
2549 | return $output; |
2550 | } |
2551 |
|
2552 | $atts = shortcode_atts( |
2553 | array( |
2554 | 'type' => 'audio', |
2555 | 'order' => 'ASC', |