1.检查当前安装的PHP包

yum list installed | grep PHP

如果有安装的PHP包，先删除他们

yum remove PHP.x86_64 PHP-cli.x86_64 PHP-common.x86_64 PHP-gd.x86_64 PHP-ldap.x86_64 PHP-mbstring.x86_64 PHP-mcrypt.x86_64 PHP-MysqL.x86_64 PHP-pdo.x86_64

2.添加rpm源

    先添加下阿里云的epel源

CentOS 6.X:

rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm

CentOS 7.X:

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

如果想删除上面安装的包，重新安装

rpm -qa | grep webstatic

rpm -e  上面搜索到的包即可

3.运行yum install安装PHP

PHP5.5:

yum install PHP55w.x86_64 PHP55w-cli.x86_64 PHP55w-common.x86_64 PHP55w-gd.x86_64 PHP55w-ldap.x86_64 PHP55w-mbstring.x86_64 PHP55w-mcrypt.x86_64 PHP55w-MysqL.x86_64 PHP55w-pdo.x86_64 PHP55w-fpm PHP55w-devel

PHP5.6:

yum install PHP56w.x86_64 PHP56w-cli.x86_64 PHP56w-common.x86_64 PHP56w-gd.x86_64 PHP56w-ldap.x86_64 PHP56w-mbstring.x86_64 PHP56w-mcrypt.x86_64 PHP56w-MysqL.x86_64 PHP56w-pdo.x86_64 PHP56w-fpm PHP56w-devel

PHP7.0:

yum install PHP70w.x86_64 PHP70w-cli.x86_64 PHP70w-common.x86_64 PHP70w-gd.x86_64 PHP70w-ldap.x86_64 PHP70w-mbstring.x86_64 PHP70w-mcrypt.x86_64 PHP70w-MysqL.x86_64 PHP70w-pdo.x86_64 PHP70w-fpm PHP70w-devel