Centos一点非常好的就是可以直接使用Yum安装软件，非常方便便捷。
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.Centos 5.X
rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpmCentOs 6.x
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpmCentOs 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 webstaticrpm -e 上面搜索到的包即可
3.运行yum install
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注：如果想升级到5.6把上面的55w换成56w就可以了。
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_644.安装PHP FPM
yum install php55w-fpm注：如果想升级到5.6把上面的55w换成56w就可以了。