code: public function addCallData(array $callData)
      {
          if ($this->isTimingProbe()) {
              $this->time += (int) $callData['wt']/1000; // ms
          }
          if ($this->isCallsProbe()) {
              $this->count += $callData['ct'];
          }
      }
docs: Adds timing/count data
  
  @param array $callData