1、进入终端后查看php版本php -v输出可能如下：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.rpmrpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
3、执行下面的命令删除phpyum remove php-common然后像安装那样问你是否继续的，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httpdservice httpd restart查看最新的版本php -v现在应该是5.6了！