Warning: mysqli_connect(): (HY000/2002): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111) in /home/whyngc5wjhjy6n6gic/wwwroot/inc/conn.php on line 18 Warning: mysqli_set_charset() expects parameter 1 to be mysqli, boolean given in /home/whyngc5wjhjy6n6gic/wwwroot/inc/conn.php on line 19 连接 MySQL 失败: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)