Return Old Input After Validation

From Controller (UserController)

  $validator = Validator::make($request->all(), [
          'first_name' => 'required|max:100',
          'last_name' => 'required|max:100',
          'gender' => 'required|numeric',
          'dob' => 'required|date|before:"2006-01-01"',
          'email' => 'required|email',
          'mobile' => 'required|numeric',
          'street' => 'required|max:255',
          'city' => 'required|alpha|max:20',
          'state' => 'required|numeric',
          'post_code' => 'required|numeric',
      ], $messages);


      if ($validator->fails()) {
          return redirect()->back()
                      ->withErrors($validator)
                      ->withInput($request->input());
      }