linux 环境，PHP连接MYSQL不上，用localhost可以，但是用127.0.0.1连接不上，是什么原因？ host改为localhost可以连接，用127.0.0.1就连接不上了。

mysql> GRANT ALL PRIVILEGES ON *.* TO root@localhost IDENTIFIED BY ' your current password ' WITH GRANT Insert the host and password This section will allow to insert the host's name and user account ...