1.因为安装php7需要2个额外的源，epel和webtatic，所以都要安装一下。

 

yum install epel-release -y

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

2.清除历史版本避免错误

yum -y remove php*

3.安装php7

yum -y install php72w php72w-cli php72w-fpm php72w-common php72w-devel

yum -y install php72w php72w-cli php72w-fpm php72w-common php72w-devel php72w-embedded php72w-gd php72w-mbstring php72w-mysqlnd php72w-opcache php72w-pdo php72w-xml

4.安装完启动服务

systemctl enable php-fpm.service
systemctl start php-fpm.service