先卸载其他版本的php

rpm -qa|grep php 查看已经安装包

rpm -e php** 卸载包

添加源

centos 7

# 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

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