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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 |
|---|---|
| 1907 | * of the default playlist output, returning the passed value instead. |
| 1908 | * |
| 1909 | * @since 3.9.0 |
| 1910 | * @since 4.2.0 The `$instance` parameter was added. |
| 1911 | * |
| 1912 | * @param string $output Playlist output. Default empty. |
| 1913 | * @param array $attr An array of shortcode attributes. |
| 1914 | * @param int $instance Unique numeric ID of this playlist shortcode instance. |
| 1915 | */ |
| 1916 | $output = apply_filters( 'post_playlist', '', $attr, $instance ); |
| 1917 | if ( $output != '' ) { |
| 1918 | return $output; |
| 1919 | } |
| 1920 | |
| 1921 | $atts = shortcode_atts( array( |
| 1922 | 'type' => 'audio', |
| 1923 | 'order' => 'ASC', |
| 1924 | 'orderby' => 'menu_order ID', |
| 1925 | 'id' => $post ? $post->ID : 0, |