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