Warning: mysqli::__construct(): (HY000/1049): Unknown database 'arena' in D:\phpstudy_pro\WWW\guess\Controller\Controller.php on line 268

Warning: mysqli::set_charset(): Couldn't fetch mysqli in D:\phpstudy_pro\WWW\guess\Controller\Controller.php on line 269

Warning: mysqli_set_charset(): Couldn't fetch mysqli in D:\phpstudy_pro\WWW\guess\Controller\Controller.php on line 271
连接失败: Unknown database 'arena'