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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 | 
|---|---|
| 739 |           } | 
| 740 |      endforeach; endif; | 
| 741 | } | 
| 742 |  | 
| 743 | function get_pung($post_id) { // Get URIs already pung for a post | 
| 744 |      global $wpdb; | 
| 745 |      $pung = $wpdb->get_var("SELECT pinged FROM $wpdb->posts WHERE ID = $post_id"); | 
| 746 |      $pung = trim($pung); | 
| 747 |      $pung = preg_split('/\s/', $pung); | 
| 748 |      $pung = apply_filters('get_pung', $pung); | 
| 749 |      return $pung; | 
| 750 | } | 
| 751 |  | 
| 752 | function get_enclosed($post_id) { // Get enclosures already enclosed for a post | 
| 753 |      global $wpdb; | 
| 754 |      $custom_fields = get_post_custom( $post_id ); | 
| 755 |      $pung = array(); | 
| 756 |      if ( !is_array( $custom_fields ) ) | 
| 757 |           return $pung; |