yum安装php7
目前一般VPS上配置的 yum repo 都是不支持安装php7的，所以需要我们去编译源码，安装依赖的扩展也要编译安装，所以这样子就非常麻烦，但是一个来自法国的PHP开发者，自己维护了一个 提供最新php7编译版本的yum源，直接配置这个源，我们就可以安装最新版本的php7了。
Centos7上的配置方式：
# yum install epel-release# rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
Centos6 上的配置方式;
# rpm -Uvh http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
在配置好了之后，在安装php7的时候，需要指定源，就像这样;
# yum install –enablerepo=remi-php70 -y php-opcache php-devel php-mbstring php-mcrypt php-mysqlnd
这个就是安装php7和它的扩展的示例，安装php5.6 就换成–enablerepo=remi-php56,在安装之前，你可以使用 yun info –enablerepo=remi-php70 php 来确认一下php的版本。
这个安装方式的具体原理请看下面的一些参考文章：
http://www.servermom.org/how-to-enable-remi-repo-on-centos-7-6-and-5/2790/
http://www.servermom.org/install-and-enable-epel-repo-on-centos-7/2780/
http://blog.remirepo.net/post/2016/04/16/My-PHP-Workstation
http://www.zabbix.cc/technic/1420/
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