CentOS/RHEL 7:
1.安装epel-release
通过命令：
yum -y install epel-release
2.安装PHP7
终端再次运行如下命令：
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
3. yum查看
yum search php70w #PHP7.0
yum search php71w #PHP7.1
4. 安装PHP 7.0的yum源，然后再执行：
yum install php70w php70w-fpm php70w-cli php70w-common php70w-devel php70w-gd php70w-pdo php70w-mysql php70w-mbstring php70w-bcmath php71w-xml
安装php 7.1以及扩展
yum install php71w php71w-fpm php71w-cli php71w-common php71w-devel php71w-gd php71w-pdo php71w-mysql php71w-mbstring php71w-bcmath php71w-xml
5. 开启服务
service php-fpm start
