一、PHP的安装
1、由于linux的yum源不存在php7.x，所以我们要更改yum源：
#rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
#rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
2、yum查询安装php71w
#yum search php71w
3、yum 安装php71w和各种拓展，选自己需要的即可。
yum install php71w php71w-cli php71w-common php71w-devel php71w-embedded php71w-fpm php71w-gd php71w-mbstring php71w-mysqlnd php71w-opcache php71w-pdo php71w-xml
php -v //就可以看到PHP版本信息了。