【解决】mysql_real_connect: Can't connect to local MySQL server through socket '/tmp/mysql.sock'

"mysql_real_connect: Can't connect to local MySQL server through socket '/tmp/mysql.sock'"
解决方法（挨个试）：
1、ln -s /run/mysql/mysql.sock /tmp/mysql.sock
2、ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
3、service mysql restart