Can Webmin run all these PHP versions together

[Joe]

Rhis is a memory leak?

You certainly have a lot of PHP versions there. That is almost never a good idea. Why did you install so many? Most people only need one version (most apps work in all the current versions), and almost nobody needs more than one of each major version (you have four 7.x versions and two 8.x versions, that’s crazy!). But, that’s still just guessing. You need to look at what’s actually using memory on your system. You can look at the process list in Webmin, or you can look at top (I prefer top) or…

And:

Rhis is a memory leak?

Also, PHP 5 has been unmaintained for years. It’s reckless to run it on a distro that doesn’t have a maintained package of it (that’s only CentOS/RHEL 7 at this point). If you must have it for some old software that you can’t update for some reason, I’d recommend you isolate that one app on its own server with no other users or data (and run CentOS or RHEL 7 so you have a maintained PHP5 package).

If you must run PHP 5, I recommend you do it on an isolated system, and you do it with an OS that still provides maintained PHP 5 packages (that is only CentOS/RHEL 7 at this point). Normally, I strongly discourage running old distros, but if you must run an ancient PHP, that’s the only reasonably safe way to do it.