code: protected function processSummary()
      {
          $str = '';
          $summaryData = $this->data['logSummary'];
          if ($summaryData) {
              \krsort($summaryData);
              $summaryData = \call_user_func_array('array_merge', $summaryData);
          }
          foreach ($summaryData as $entry) {
              $channel = isset($entry[2]['channel']) ? $entry[2]['channel'] : null;
              if ($this->channelTest($channel)) {
                  $str .= $this->processLogEntryWEvent($entry[0], $entry[1], $entry[2]);
              }
          }
          return $str;
      }
docs: Process summary
  
  @return string