code: protected function getValidationData(array $rules, array $customAttributes = [])
      {
          $attributes = array_filter(array_keys($rules), function ($attribute) {
              return $attribute !== '' && mb_strpos($attribute, '*') !== false;
          });
  
          $attributes = array_merge(array_keys($customAttributes), $attributes);
          $data = array_reduce($attributes, function ($data, $attribute) {
              Arr::set($data, $attribute, true);
  
              return $data;
          }, []);
  
          return $data;
      }
docs: Gets fake data when validator has wildcard rules.
  
  @param array $rules
  @return array