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, 如：
yum remove php.x86_64 php-cli.x86_64 php-common.x86_64
2、配置安装包源
# Centos 5.X rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpm # CentOs 6.x yum install epel-release -y rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm # CentOs 7.X rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm 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、执行安装
yum -y install php56w.x86_64 yum -y --enablerepo=webtatic install php56w-devel yum -y install php56w-pdo php56w-xml php56w-gd 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-opcache.x86_64
4、安装 PHP FPM
yum -y install php56w-fpm
#设置php-fpm开机启动 chkconfig php-fpm on
#启动php-fpm /etc/init.d/php-fpm start
注：如果想更换到php5.5或5.4版本, 直接把上面的56w换成55w或者54w就可以了
原文：https://www.cnblogs.com/morgan363/p/11865630.html