This may be grasping at straws, and more work than its worth, but I'm hoping someone knows the definitive answer....
I took an old PC and first installed "Linux debian 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) x86_64" on it, pretty much bare bones without a desktop interface, then installed OMV (it's the latest version as of today) and the nginx plugin, among others, on it. Its main "job" is just a test bed for some web software which I support through work.
It works fine with nginx at the moment, which is by default using PHP v5.6, but now I need to get PHP 7.1 or greater installed (7.3 would be preferred) and used by default via the nginx plugin, since the latest version of the software I support requires PHP 7.1 or greater.
From looking at the folders on disk (/usr/bin/), it appears that I have PHP 7.0 already installed, though see no way to "tell" nginx to use that by default. Problem is that I need at least PHP 7.1 for my use case.
Is what I want to do even possible, given OMV only offers nignx as an Apache substitute?
If so, is it just a couple (or several) file edits, or am I looking at a lot of work?
Or is this something I'd be best off accomplishing by rebuilding the entire computer from scratch with a different flavor of Linux then adding OVM and nginx to it?
All help appreciated, thanks in advance.