[tambourine_man]

Installing multiple versions is solved, changing the environment easily, not so much, I think

[Cyberdog]

I'm not sure of the specifics with Homebrew, but with MacPorts, I have both PHP 7.4 and 8.1 running via FPM and serving sites rather trivially. The basics: Install both php74-fpm and php81-fpm, configure the former to put its socket at /var/run/php74-fpm.sock and the latter at /var/run/php81-fpm.sock, configure nginx's domain-specific config files to look for the FastCGI socket that the respective path, use MacPorts to load both daemons, and away you go. I imagine a similar approach would be possible with Homebrew.

[tambourine_man]

I edit Apache’s config files and reload it every time, but I’m not pleased with that solution.

[Cyberdog]

Is there not a way in Apache to specify a different path for the FastCGI socket based on the domain name? It's been a long time since I've used Apache but I'd be surprised if the functionality wasn't somewhere in its inscrutable config file syntax.

[tambourine_man]

That’s a really cool idea, never though of that. I’ll investigate, thanks! Sorry for the late reply.