downgrade php 7.4 to 5.6 centos 7 code example

Example: upgrade php 5.6 to 7 centos 7

$ wget -q http://rpms.remirepo.net/enterprise/remi-release-7.rpm
$ wget -q https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm