pocketmine\utils\Config::remove PHP Метод

    public function remove($k)
    {
        unset($this->config[$k]);
    }

 /**
  * @param Player $player
  * @param bool $value
  */
 public function setExempt(Player $player, $value = true)
 {
     if ($value) {
         $this->exempts->set(strtolower($player->getName()));
         $this->exempts->save();
     } else {
         $this->exempts->remove(strtolower($player->getName()));
         $this->exempts->save();
     }
 }