php -i|grep Client
查询当前Client 版本，结果如下：
Client API version => 5.6.31
Client API library version => 5.6.31
Client API header version => 5.5.47-MariaDB
Client API version => 5.6.31
1 yum remove php-mysql 2 yum install php-mysqlnd
解决Warning: mysql_connect(): Headers and client library minor version mismatch. 警告
原文：https://www.cnblogs.com/aboys/p/9208227.html