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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 |
|---|---|
| 704 | do_action( 'comment_duplicate_trigger', $commentdata ); |
| 705 | |
| 706 | /** |
| 707 | * Filters duplicate comment error message. |
| 708 | * |
| 709 | * @since 5.2.0 |
| 710 | * |
| 711 | * @param string $comment_duplicate_message Duplicate comment error message. |
| 712 | */ |
| 713 | $comment_duplicate_message = apply_filters( 'comment_duplicate_message', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ) ); |
| 714 | |
| 715 | if ( $wp_error ) { |
| 716 | return new WP_Error( 'comment_duplicate', $comment_duplicate_message, 409 ); |
| 717 | } else { |
| 718 | if ( wp_doing_ajax() ) { |
| 719 | die( $comment_duplicate_message ); |
| 720 | } |
| 721 | |
| 722 | wp_die( $comment_duplicate_message, 409 ); |