function _fnc() {
		$args = func_get_args(); 
		$path = "system/functions/";
		
		if ($loc = strrpos($args[0], '/')) list($path, $func) = split('-l-', chunk_split($args[0], $loc+1, '-l-'));
		else $func = $args[0];
		
		unset($args[0]);

		if (!function_exists($func)) include_once($path.$func.'.php');
		return call_user_func_array($func, $args);
	}


//this would be its own seperate page called do.php in system/functions/
function do($arg1, $arg2)
{
return $arg1 + $arg2;
}

//you call it this way
_fnc("do", 1, 1);