Install EPEL
sudo yum install epel-release
Install webtatic repo and PHP from testing:
yum install https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum --enablerepo=webtatic-testing install php70w-cli php70w-common php70w-fpm php70w-gd php70w-mbstring php70w-mysql php70w-pdo php70w-process php70w-xml php70w-opcache
Start service:
service php-fpm start