Routing 使用可选参数配置Silex路由

我已经配置了这两条路由

$app->match ( '/controller/param/{country}/{q}', "demo.controller:demoAction" )->value ( 'country', 'de' )->value('q', '')->bind ( 'demo_action_with_country' );
$app->match ( '/controller/param/{q}', "demo.controller:demoAction" )->value ( 'q', '' )->bind ( 'demo_action_without_country' );

但是，这不起作用。如果调用

/controller/param/Test String

，路由将匹配并返回内容。如果我调用

/controller/param/DE/Test String

，我会得到NotFoundHttpException

---

我怎样才能解决这个问题呢？

好的，我可以自己轻松解决这个问题。以下是我的解决方案：

$app->match ( '/controller/param/{q}', "demo.controller:demoAction" )->value ( 'q', false )->bind ( 'demo_action_without_country' );
$app->match ( '/controller/param/{country}/{q}', "demo.controller:demoAction" )->value ( 'country', false )->value('q', '')->bind ( 'demo_action_with_country' );