Calling method of other class

[eluser]bapobap[/eluser]
Hi all,

I've coded an API which uses the following to route requests:

$controller_name::$controller_method();

This works fine in PHP 5.3+ but it doesn't in 5.2, which is unfortunately what my server is running (have no control over updating).

Is there anyway around this? I've found references to stuff like call_user_func but then the method I'm calling doesn't see the big $this singleton.

Thanks if you can help, just spent 3 days re-writing code, only to find the entire thing won't work because of this one line of code :-S