网上很多方案，使用yum安装一般采用下面的方法（此种方法有可能会安装不成功）；

1. 安装epel-release

   
   

   rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

       (由于网站原因、防火墙、iptables受限等原因，会报 curl: (7) Failed connect to dl.fedoraproject.org:80; 拒绝连接 的错误)

    2.安装PHP7的rpm源

        

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




  3.安装PHP7




    yum installphp70w

 




建议使用下面方案安装，本人亲测可用：




  1.安装epel-release





     yum -y install epel-release


    2.获取PHP7的yum源

        

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

    3.安装PHP7

        yum install php70w

    4.验证安装

        php -v