pocketmine\event\player\PlayerChatEvent::setMessage PHP Method

    public function setMessage($message)
    {
        $this->message = $message;
    }

 public function onChat(PlayerChatEvent $event)
 {
     $this->badwords = new Config($this->getDataFolder() . "/Badwords/" . ".yml", Config::YAML);
     $msg = $event->getMessage();
     $badwords = $this->cfg->get("badwords");
     $neuersatz = str_ireplace($badwords, "****", $msg);
     $event->setMessage($neuersatz);
 }