如果已经安装过php，先删除之。编译安装直接删掉目录即可，yum源安装yum remove php。

更新centos7yum源

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

如果和系统自带的php冲突

yum list installed | grep php | gerp 5.4

列出系统php老版本，删除

yum remove php-common.x86_64

再安装

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

如果是centos6.x

使用rpm -Uvh https://mirror.webtatic.com/yum/el6/latest.rpm源

这个源没有php72，不过可以使用php71

yum -y install php71w php71w-cli php71w-common php71w-devel php71w-embedded php71w-fpm php71w-gd php71w-mbstring php71w-mysqlnd php71w-opcache php71w-pdo php71w-xml php71w-bcmath