How to install PHP 5.6 as additional اضافی اضافی، افزوده PHP-FPM & FastCGI for ISPConfig 3.1 on Ubuntu 16.04

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This tutorial shows how to build PHP 5.6 as a PHP-FPM and a FastCGI version on Ubuntu 16.04 (Xenial Xerus). Ubuntu 16.04 ships with PHP 7 by default but there are still many websites out there that don't support PHP 7. This tutorial will show you how to install PHP 5.6 as additional اضافی اضافی، افزوده PHP version on Ubuntu 16.04 so that you can switch between both versions for each website individually in ISPConfig.