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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 |
|---|---|
| 690 | |
| 691 | if ( $dupe_id ) { |
| 692 | /** |
| 693 | * Fires immediately after a duplicate comment is detected. |
| 694 | * |
| 695 | * @since 3.0.0 |
| 696 | * |
| 697 | * @param array $commentdata Comment data. |
| 698 | */ |
| 699 | do_action( 'comment_duplicate_trigger', $commentdata ); |
| 700 | |
| 701 | /** |
| 702 | * Filters duplicate comment error message. |
| 703 | * |
| 704 | * @since 5.2.0 |
| 705 | * |
| 706 | * @param string $comment_duplicate_message Duplicate comment error message. |
| 707 | */ |
| 708 | $comment_duplicate_message = apply_filters( 'comment_duplicate_message', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ) ); |