class TestController

class TestController {
    public function accessAllow() {
        return AccessResult::allowed();
    }
    public function accessDeny() {
        return AccessResult::neutral();
    }
    public function accessParameter($parameter) {
        return AccessResult::allowedIf($parameter == 'TRUE');
    }
    public function accessRequest(Request $request) {
        return AccessResult::allowedIf($request->query
            ->get('example') === 'muh');
    }

}