I have an existing ISPConfig 3 installation (18.104.22.168p9) and am using the latest CentOS 7.2 PHP package available: PHP 5.4.16. I do note that the Remi repository include PHP 7.1. I'm looking to upgrade PHP because we use RocketTheme Joomla templates for websites and they will soon be no longer supporting PHP 5.4. Can someone point me to the safest and easiest way to upgrade PHP to a more modern PHP version for CentOS 7.2 without breaking ISPConfig functionality? I don't care if the best way to upgrade PHP involves Remi or not--as long as it is safe and, hopefully, easy. I also don't care if the upgraded PHP version is 7.1. I just need something that will work with RocketTheme templates.