Module system

[eluser]Jelmer[/eluser]
I'm not sure if I understand exactly what you want but the bottom line is that you want to dynamicly choose both the module and function, right?
Which you tried doing like:
[quote author="daveario" date="1249597401"]

Code:

$this->$module->$function(); # doesn't work.

[/quote]

And that probably didn't work because PHP doesn't know which variable to resolve first or last, it could be ($this->$module)->$function or $this->($module->$function). You can solve that by using accolades:

Code:

$this->{$module}->{$function}()

I'm not entirely sure if I used them right (I've only used this twice before a while ago), but this is the general direction.