How to install PHP 7.x as PHP-FPM & FastCGI for ISPConfig 3.1 with apt on Debian 8 and 9
This post is from 2017. Versions, commands and links in it may be outdated. The current release is ISPConfig 3.3.2p1.
This tutorial shows how to install PHP 7.x as a PHP-FPM and a FastCGI version on a Debian Jessie or Stretch server from the Debian PHP Package maintainers site directly.
Read more: How to install PHP 7.x as PHP-FPM & FastCGI for ISPConfig 3.1 with apt on Debian 8 and 9