注意：一定要先安装Mysql后再安装PHP，否则安装其他版本的mysql的时候mysql-libs会报错，当然，卸载了mysql-libs也就可以继续安装了。
1.检查当前安装的PHP包
yum list installed | grep php
如果有安装的PHP包，先删除他们
yum remove php*
2、安装rpm源包
Centos 5.X
rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpm
CentOs 6.x
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
CentOs 7.X
rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
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