How can i cancel a task running for one player when he lefts?

How can i cancel a task running for one player when he lefts? should i get the taskid?

 

PHP:

// On PluginTask
$this->getOwner()->getServer()->getScheduler()->cancelTask($this->getTaskId());

 

Men, i know how to cancel a task, but i want to cancel a task registered for a player when they left the server............

 

Do you want to identify whether the player is online in the onRun function, and cancel if it is offline.

PHP:

public function onRun($tick) {
  if (!$this->player->isOnline()) {
    // On offline!
    $this->getOwner()->getServer()->getScheduler()->cancelTask($this->getTaskId());
  }else {
    // something
  }
}