如何从Symfony2请求对象中删除单个参数

use Symfony\Component\HttpFoundation\Request;

// 获取当前请求对象
$request = Request::createFromGlobals();

// 获取请求参数
$param = $request->request->get('param_name');

// 删除请求参数
$request->request->remove('param_name');

// 删除GET参数
$request->query->remove('param_name');

// 删除属性参数
$request->attributes->remove('param_name');