_get_comment_reply_id( int|WP_Post|null $post = null ): int

2165function _get_comment_reply_id( $post = null ) {2166	$post = get_post( $post );2167 2168	if ( ! $post || ! isset( $_GET['replytocom'] ) || ! is_numeric( $_GET['replytocom'] ) ) {2169		return 0;2170	}2171 2172	$reply_to_id = (int) $_GET['replytocom'];2173 2174	/*2175	 * Validate the comment.2176	 * Bail out if it does not exist, is not approved, or its2177	 * `comment_post_ID` does not match the given post ID.2178	 */2179	$comment = get_comment( $reply_to_id );2180 2181	if (2182		! $comment instanceof WP_Comment ||2183		0 === (int) $comment->comment_approved ||2184		$post->ID !== (int) $comment->comment_post_ID2185	) {2186		return 0;2187	}2188 2189	return $reply_to_id;2190}