1.进入终端后查看php版本 

php -v 

输出如下： 

PHP 5.4.35 (cli) (built: Nov 14 2014 07:04:10) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2015, by Zend Technologies 

2.执行下面的命令升级软件仓库 

rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm 
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm 

3.执行下面的命令删除php 

yum remove php-common 

然后像安装那样问你是否继续的，重庆监控安防，输入yes即可 

4.安装php 5.6版本（php56w-devel这个不是必需的） 

yum install -y php56w php56w-opcache php56w-xml php56w-mcrypt php56w-gd php56w-devel php56w-mysql php56w-intl php56w-mbstring 

5.重启httpd 

service httpd restart 

查看最新的版本 

php -v