laravel 获取路由中? 问号 后面的参数

/*
 *  http://127.0.0.1:8000/index?id=5
 *  hello_5
 **/
Route::get('index/',function (){
    return 'hello_'.$_GET['id'];
});

/*
* 控制器接收 ?（问号）参数
 *  http://127.0.0.1:8000/userGetRead?id=5
*/
Route::get('userGetRead','UserController@getRead');

C代码
public function getRead()
{
    return 'getRead_'.$_GET['id'];
}