onCompletion() public method

Actions to execute when completed (on main thread) Implement this if you want to handle the data in your AsyncTask after it has been processed
public onCompletion ( Server $server ) : void
$server pocketmine\Server
return void
 public function collectAsyncTask(AsyncTask $task)
 {
     if ($task->isFinished() and !$task->isCompleted()) {
         --$this->asyncTasks;
         $task->onCompletion(Server::getInstance());
         $task->setCompleted();
         unset($this->asyncTaskStorage[$task->getTaskId()]);
         return true;
     }
     return false;
 }