_get_comment_reply_id

WordPress Version: 6.2

/**
 * Gets the comment's reply to ID from the $_GET['replytocom'].
 *
 * @since 6.2.0
 *
 * @access private
 *
 * @param int|WP_Post $post The post the comment is being displayed for.
 *                          Defaults to the current global post.
 * @return int Comment's reply to ID.
 */
function _get_comment_reply_id($post = null)
{
    $post = get_post($post);
    if (!$post || !isset($_GET['replytocom']) || !is_numeric($_GET['replytocom'])) {
        return 0;
    }
    $reply_to_id = (int) $_GET['replytocom'];
    /*
     * Validate the comment.
     * Bail out if it does not exist, is not approved, or its
     * `comment_post_ID` does not match the given post ID.
     */
    $comment = get_comment($reply_to_id);
    if (!$comment instanceof WP_Comment || 0 === (int) $comment->comment_approved || $post->ID !== (int) $comment->comment_post_ID) {
        return 0;
    }
    return $reply_to_id;
}