What is the recommended version of PHP for the CWP7 Pro application?

I've been using CWP7 Pro for some time and originally the CWP application installed and utilizes version v5.6.30 of PHP, although that was over two years ago and I wanted to inquire what the recommended/ideal version of PHP is for the application; does that still remain v5.6.30 or has it changed to a newer version?

(FWIW, this isn't about the PHP versions available to user/domain/websites, but solely the CWP application itself).

Application Version
PHP version: 5.6.30 [PHP Switcher]

PHP Version Switcher v2
You are running PHP version: 5.6.30

I'm looking for forward to your responses.

Thanks!

Not sure it really matters for CWP. If there were features depending on a newer version of PHP it would probably have been upgraded thus.

The PHP switcher is likely more for other applications running on the server. I am currently on PHP 7.1.9