System upgrade brings PHP (7.x --> 8.1.2) problem

[beerslayer]

Hi, all -

I have a laptop running Linux Mint 21.3. I have just upgraded it from Mint 20.3. This system upgrade seems to have had ramifications for Abyss, which was also running on this system.

First of all, the upgrade installed Apache2 without asking, which immediately took over as the primary web server. I was able to uninstall it with no problem, but now Abyss isn't starting with the computer. But this isn't the real issue. I can start it manually, and can probably figure this out without help.

The real problem is that the system upgrade also appears to have upgraded PHP. I do not recall exactly which version I had before, but I'm pretty sure it was 7.x. All of my PHP scripts were working just fine under Abyss prior to the upgrade. Now, following the upgrade, PHP has been upgraded to 8.1.2, and PHP scripts are all failing with 500 errors. Plain HTML, Perl, and Python scripts still work fine. It appears to be only PHP that is affected.

Is there a likely, simple, stupid fix to get my PHP scripts working again under 8.1.2? A parameter change somewhere, perhaps? Or is this problem likely to be more pervasive?
_________________
"If fifty million people say a foolish thing, it is still a foolish thing." -- Anatole France

[admin]

beerslayer,

The first issue with automatic startup should be resolved by running the

[beerslayer]