我不确定，如果您的调用 $request->request 是错字.

I am not sure, if your call $request->request is typo.

你应该使用 $request->attributes 操作，它代表 ParameterBag 类.

You should operate with $request->attributes which represents ParameterBag class.

如果您将通过 中的方法ParameterBag 你会看到没有办法在数组内取消设置变量.

If you'll go through methods in ParameterBag you'll see that there is no way to unset variable inside array.