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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 | 
|---|---|
| 50 |      wp_die( __('Sorry, comments are closed for this item.') ); | 
| 51 | } elseif ( 'trash' == $status ) { | 
| 52 |      /** | 
| 53 |       * Fires when a comment is attempted on a trashed post. | 
| 54 |       * | 
| 55 |       * @since 2.9.0 | 
| 56 |       * | 
| 57 |       * @param int $comment_post_ID Post ID. | 
| 58 |       */ | 
| 59 |      do_action( 'comment_on_trash', $comment_post_ID ); | 
| 60 |      exit; | 
| 61 | } elseif ( ! $status_obj->public && ! $status_obj->private ) { | 
| 62 |      /** | 
| 63 |       * Fires when a comment is attempted on a post in draft mode. | 
| 64 |       * | 
| 65 |       * @since 1.5.1 | 
| 66 |       * | 
| 67 |       * @param int $comment_post_ID Post ID. | 
| 68 |       */ |