1. 更换rpm 源，执行下面两个
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
//查看
yum search php71w
2. 安装php7.1 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
3. 检查PHP版本
php -v
Centos7 安装PHP7版本
原文地址：https://www.cnblogs.com/beyang/p/10197664.html