code: protected function extractInputFromRules($data, array $rules) {
          $keys = collect($rules)->keys()->map(function ($rule) {
              return explode('.', $rule)[0];
          })->unique()->toArray();
          if (!($data instanceof Request)) {
              $data = collect($data);
          }
          return $data->only($keys);
      }
docs: Get the request input based on the given validation rules.
  
  @param array|Request $data
  @param array $rules
  @return array