Thread::getThreadId PHP Method

    public function getThreadId()
    {
    }

 private function spawnWorker()
 {
     $results = new SharedData();
     $resultCodes = new SharedData();
     $thread = new Thread($results, $resultCodes, $this->ipcUri);
     if (!$thread->start()) {
         throw new \RuntimeException('Worker thread failed to start');
     }
     $worker = new Worker();
     $worker->id = $thread->getThreadId();
     $worker->results = $results;
     $worker->resultCodes = $resultCodes;
     $worker->thread = $thread;
     $this->pendingWorkers[$worker->id] = $worker;
     $this->pendingWorkerCount++;
     return $worker;
 }