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

    public function setQuitMessage($quitMessage)
    {
        $this->quitMessage = $quitMessage;
    }

 public function onKick(PlayerKickEvent $event)
 {
     $player = $event->getPlayer();
     $onlinekey = array_search($player->getName(), $this->onlinelist);
     if ($onlinekey !== false) {
         array_splice($this->onlinelist, $onlinekey, 1);
     }
     $offlinekey = array_search($player->getName(), $this->offlinelist);
     if ($offlinekey === false) {
         if (count($this->offlinelist) >= 5) {
             array_shift($this->offlinelist);
         }
         $this->offlinelist[] = $player->getName();
     }
     $player_d_name = explode("d", $player->getName());
     if (is_numeric($player->getName()) or isset($player_d_name[1]) and is_numeric($player_d_name[1])) {
         $event->setQuitMessage("");
         return;
     }
     if (isset($this->ipban_data[$player->getAddress()])) {
         $event->setQuitMessage("");
         return;
     }
     if (isset($this->ban_data[$player->getName()])) {
         $event->setQuitMessage("");
         return;
     }
     if (isset($this->subban_data[$player->getAddress()])) {
         $event->setQuitMessage("");
         return;
     }
 }