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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 | 
|---|---|
| 700 |           do_action( 'comment_duplicate_trigger', $commentdata ); | 
| 701 |  | 
| 702 |           /** | 
| 703 |            * Filters duplicate comment error message. | 
| 704 |            * | 
| 705 |            * @since 5.2.0 | 
| 706 |            * | 
| 707 |            * @param string $comment_duplicate_message Duplicate comment error message. | 
| 708 |            */ | 
| 709 |           $comment_duplicate_message = apply_filters( 'comment_duplicate_message', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ) ); | 
| 710 |  | 
| 711 |           if ( $wp_error ) { | 
| 712 |                return new WP_Error( 'comment_duplicate', $comment_duplicate_message, 409 ); | 
| 713 |           } else { | 
| 714 |                if ( wp_doing_ajax() ) { | 
| 715 |                     die( $comment_duplicate_message ); | 
| 716 |                } | 
| 717 |  | 
| 718 |                wp_die( $comment_duplicate_message, 409 ); |