Laravel - Requests - Retrieving Old Input

To retrieve flashed input from the previous request, invoke the old method on an instance of Illuminate\Http\Request. The old method will pull the previously flashed input data from the session:

    $username = $request->old('username');

Laravel also provides a global old helper. If you are displaying old input within a Blade template, it is more convenient to use the old helper to repopulate the form. If no old input exists for the given field, null will be returned: