Hello, I would like to know what versions of PHP are required for ISPConfig itself and its services without taking into account sites created. From using ISPConfig i know that PHPMYADMIN needs PHP 7.4 to run but can't seem to find any other details on other versions/services. I mainly want to disable/remove unneeded PHP versions (I run a very low end cloud host). Currently i have all PHP versions installed via the autoinstaller and want to disable/remove all versions except 7.4/8.0 if possible. However not sure if it affect any of the currently running services. Thank you for the help.
ISPConfig itself uses the default PHP version that comes with the Operating System. For the additional PHP versions, try it out. Disable them one by one, and test if system still works. If you have checked no website uses that PHP version, things should still work. I'm not sure significant resources are saved by disabling php master processes. It may use some memory, but If nothing uses that PHP version memory is swapped out to disk.
Check the autoinstaller tutorial for relevant parameters for customization. You do not have to install all and you can opt for only what you wanted by choosing the right parameters.