SQLSTATE[HY000] [2003] Can't connect to MySQL server on 'xxx.xxx.xxx.xxx' (4);这个是tp5的。at PDO->__construct('mysql:dbname=sc286;host=xxx.xxx.xxx.xxx;port=3306;charset=utf8', 'sc286', 'H1kmzNj70odFsl0O', [0, 2, 0, ...]) in Connection.php line 300；database中数据库名称不是sc286