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
可以安装的包
yum search php70w
删除旧的
yum remove php*
安装7.0
yum install php70w
yum install php70w-fpm.x86_64
yum install php70w-gd.x86_64 php70w-mysql.x86_64
systemctl restart php-fpm