如何在 Silex 上获取所有 GET 参数？

我已经使用Silex一天了，我有第一个“愚蠢”的问题。如果我有：

$app->get('/cities/{city_id}.json', function(Request $request, $city_id) use($app) {
    ....
})
->bind('city')
->middleware($checkHash);

我想获取中间件中包含的所有参数（city_id）：

$checkHash = function (Request $request) use ($app) {

    // not loading city_id, just the parameter after the ?
    $params = $request->query->all();

    ....
}

那么，我如何在中间件中获取city_id（参数名称及其值）。我将有大约30个动作，所以我需要一些可用且可维护的东西。

我错过了什么？

多谢！

溶液

我们需要获得$request>属性的额外参数

$checkHash = function (Request $request) use ($app) {

    // GET params
    $params = $request->query->all();

    // Params which are on the PATH_INFO
    foreach ( $request->attributes as $key => $val )
    {
        // on the attributes ParamaterBag there are other parameters
        // which start with a _parametername. We don't want them.
        if ( strpos($key, '_') != 0 )
        {
            $params[ $key ] = $val;
        }
    }

    // now we have all the parameters of the url on $params

    ...

});