remi repo로 설치를 합니다.

http://blog.remirepo.net/post/2016/02/14/Install-PHP-7-on-CentOS-RHEL-Fedora

cd /etc/yum.repos.d
wget http://rpms.remirepo.net/enterprise/remi.repo

yum install php70

yum install php70-php-gd php70-php-fpm php70-php-pdo php70-php-mbstring php70-php-soap php70-php-xml php70-php-mysqlnd php70-php-phpize

설치가능한 php package의 종류들 입니다.

http://serverfault.com/questions/706349/install-php7-from-remi-repo

link를 바꿔줍니다.

ln -s /usr/bin/php70 /usr/bin/php

systemctl start php70-php-fpm

systemctl enable php70-php-fpm