Setting up LAMP server on Linux Mint 19 and downgrade to PHP 7.1 This is a tutorial on setting up LAMP server on Linux Mint and use PHP 7.1 instead of 7.2 version.
Getting custom user php.ini per domain on cPanel/WHM to work cPanel v58 with EasyApache 4 allows users to override default PHP config values by placing a custom php.ini in domain's webroot.
Installing Memcache on CentOS 7 running PHP 5.6 This article will get you thru getting Memcache installed on your server and running it with Drupal 7 or 8.