code: public function fetchAll() {
          $list = [];
          foreach($this->cache as $domain => $values) {
              foreach($values as $key => $value)
                  $list[ sprintf("%s.%s", $domain!='<NULL>' ? $domain : '', $key) ] = $value;
          }
          return $list;
      }
docs: Fetches all values
  @return array