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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 | 
|---|---|
| 2443 |      $post['post_status'] = $post_status; | 
| 2444 |  | 
| 2445 |      delete_post_meta($post_id, '_wp_trash_meta_status'); | 
| 2446 |      delete_post_meta($post_id, '_wp_trash_meta_time'); | 
| 2447 |  | 
| 2448 |      wp_insert_post($post); | 
| 2449 |  | 
| 2450 |      wp_untrash_post_comments($post_id); | 
| 2451 |  | 
| 2452 |      do_action('untrashed_post', $post_id); | 
| 2453 |  | 
| 2454 |      return $post; | 
| 2455 | } | 
| 2456 |  | 
| 2457 | /** | 
| 2458 |  * Moves comments for a post to the trash | 
| 2459 |  * | 
| 2460 |  * @since 2.9.0 | 
| 2461 |  * @uses do_action() on 'trash_post_comments' before trashing |