Thread:Extension talk:CheckUser/Bug installing CheckUser for 1.19/reply (3)

I’m afraid trying to tweak MediaWiki to run at PHP 4.x would be a huge amount of work (it’s not just this script, this is only a wrapper, you would need to modify a large amount of MediaWiki codebase), practically impossible.

Are you sure you cannot run PHP 5.x from the shell? Maybe under a different name, e.g.  instead of just  ? Or maybe from a directory not in PATH?

If not, maybe you could try to get install.php running in the web context, so that it runs in 5.x? (Maybe using something like phpShell? See e.g. Manual:Upgrading to 1.14.)