Laravel:从`Input`重置一些值

Is there any way that I can reset some value from the Input on the server side. Let's say, I am getting the value in foo i.e. Input::get('foo') on the server side, but I don't want that in Input. How may I reset that?

Now all I can think of is getting $formData = Input::except('foo') to get all the input values except foo and the processing this $formData instead. But I don't want to change my whole implementation for that, so is there any otherway provided by Laravel?

Was as simple, as the following:

Input::merge(array('foo' => null));