Simple routing system

routing.php

function route($method, $route, $func = null) {
        static $routes = array();
        if(!$func) {
                $r = null;
                $n = '';
                $argv = array();
                foreach(explode('/', $route) as $arg) {
                        $n .= ($n == '/' ? $arg : "/$arg");
                        if($r)
                                $argv[] = $arg;
			if(isset($routes[$method][$n])) {
                                $r = $routes[$method][$n];
				$argv = array();
				if($route == $n)
					break;
			}
			if(isset($routes[$method]["$n/"])) {
                                $r = $routes[$method]["$n/"];
				$argv = array();
			}
                }
                if(!$r)
                        die('No route found.');
                if(count($argv) < $r['mandatory'])
                        die('Missing arguments');
                if(count($argv) > $r['argc'])
                        die('Too many arguments');
                return call_user_func_array($r['func'], $argv);
        }
        $name = array();
        $argc = 0;
        $mandatory = 0;
        foreach(explode('/', $route) as $arg) {
                switch(@$arg[0]) {
                        case '!': ++$argc; ++$mandatory; break;
                        case '?': ++$argc; break;
                        default: $name[] = $arg; break;
                }
        }
        $name = implode('/', $name);
	if($argc)
		$name .= '/';
        $routes[$method][$name] = array('func' => $func, 'argc' => $argc, 'mandatory' => $mandatory);
        return 0;
}