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Multiple versions of PHP on the same web server
looks like a job for PHP-FPM...
For better or worse I administer my own web server / web-services. I actually quite enjoy this, but I'm not a professional, which means sometimes I learn things the hard way, and sometimes I make mistakes. I recently installed an invoicing system, which needed PHP 8.1+. Most of my web applications run on 7.4, specifically mediawiki. I would prefer it if everything was on 8.1 and I'm slowly getting there.
I learned about a nifty new tech PHP-FPM, which enables (among other things) multiple versions of PHP on a per-site basis. Which is cool. The end goal is to (of course) use only one version of PHP but for now I am enjoying the tinkering.