How do I upgrade my CentOS 7 Linode to PHP7?

yum install https://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum-config-manager --enable remi-php74
yum update

ref:https://www.linode.com/community/questions/19740/how-do-i-upgrade-my-centos-7-linode-to-php7