Warning: mysqli_connect(): (HY000/1049): Unknown database 'test_mysqli_old' in D:\phpStudy\WWW\work\20250919\mysqli_operations_old.php on line 10
错误: 连接失败: Unknown database 'test_mysqli_old'
Warning: mysqli_ping() expects parameter 1 to be mysqli, boolean given in D:\phpStudy\WWW\work\20250919\mysqli_operations_old.php on line 98