duplicate_comment_id filter-hook . WP 4.4.0

Filters the ID, if any, of the duplicate comment found when creating a new comment.

Return an empty value from this filter to allow what WP considers a duplicate comment.

Usage

add_filter( 'duplicate_comment_id', 'filter_function_name_40', 10, 2 );
function filter_function_name_40( $dupe_id, $commentdata ){
	// filter...

	return $dupe_id;
}

$dupe_id(int)

ID of the comment identified as a duplicate.

$commentdata(array)

Data for the comment being created.

Where the hook is called

$dupe_id = apply_filters( 'duplicate_comment_id', $dupe_id, $commentdata );

Where the hook is used (in WP core)