comment_exists( string $comment_author, string $comment_date, string $timezone = 'blog' ): string|null

26function comment_exists( $comment_author, $comment_date, $timezone = 'blog' ) {27	global $wpdb;28 29	$date_field = 'comment_date';30	if ( 'gmt' === $timezone ) {31		$date_field = 'comment_date_gmt';32	}33 34	return $wpdb->get_var(35		$wpdb->prepare(36			"SELECT comment_post_ID FROM $wpdb->comments37			WHERE comment_author = %s AND $date_field = %s",38			stripslashes( $comment_author ),39			stripslashes( $comment_date )40		)41	);42}