pocketmine\event\player\PlayerKickEvent::getQuitMessage PHP Method

    public function getQuitMessage()
    {
        return $this->quitMessage;
    }

 /**
  * Kicks a player from the server
  *
  * @param string $reason
  * @param bool   $isAdmin
  *
  * @return bool
  */
 public function kick($reason = "Disconnected from server.")
 {
     $this->server->getPluginManager()->callEvent($ev = new PlayerKickEvent($this, $reason, TextFormat::YELLOW . $this->username . " has left the game"));
     if (!$ev->isCancelled()) {
         $message = $reason;
         $this->sendMessage($message);
         $this->close($ev->getQuitMessage(), $message);
         return true;
     }
     return false;
 }