Can anyone here instruct me way to install and configure Multi PhP with one apache instance on CentOS 7, and the proper way to test it..
As explained by @runwuf, this is possible using the sofware collections available in centos-scl repository or in remi repository.
But using SetHandler to fastcgi proxy seems a better and more modern way, thanks to httpd 2.4:
SetHandler "proxy:fcgi://127.0.0.1:9000"
This is explained in some blog posts: