前提环境是配置了阿里云的基础源和epel源
首先安装epel-release
yum install epel-release -y接着安装php7.2的镜像源
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm安装php7.2
yum install php72w php72w-mysqli php72w-mbstring php72w-gd php72w-curl php72w-cli php72w-common php72w-process多说一点，centos7默认的php版本是5.4，下载7.2版本就是在php后面加上了72w
如果是5.5版本就是55w