从php线程获取返回值

Question

This is the sample code, I'm working on

class workerThread extends Thread {
  public function __construct($i){
     $this->i=$i;
}

public function run(){
  while(true){
   echo $this->i;
   sleep(1);
  }
}
}

for($i=0;$i<50;$i++){
$workers[$i]=new workerThread($i);
$workers[$i]->start();
}

What is the appropriate way to get return value from run() or should create another function for callback?

Answer 1

well first you have to wait for all threads to finish.

so after your initial loop you should do one more loop waiting for each worker to finish. there is thread->join function that syncs your main thread with the sub-thread. causing to halt the execution and wait until the sub thread finishes. so if you call if($worker->join()) {...} you can be sure, that the worker is done working :)

http://php.net/manual/de/thread.join.php

second, a thread does not return a value. instead create a variable in your class, for example result and fill it with data during the run of a thread. collect at the end (after join ) the $worker->result

third, your current threads even cannot report any result, as they run for ever. From the question I dont understand, if you want them to run for ever? Because if you do there are more complicated steps involved to get the results continuously.