A PocketMine script to prevent players from joining using a different IP than the ones allowed

PlayerIPLocker.php

<?php
/**
 * @name PlayerIPLock
 * @main jasonwynn10\PlayerIPLock\Main
 * @version 0.1.0
 * @api 3.0.0-ALPHA7
 * @description A PocketMine plugin script to prevent players from joining using a different IP than the ones allowed
 * @author jasonwynn10
 */
namespace jasonwynn10\PlayerIPLock {

	use pocketmine\event\Listener;
	use pocketmine\event\player\PlayerPreLoginEvent;
	use pocketmine\plugin\PluginBase;
	use pocketmine\utils\Config;

	class Main extends PluginBase implements Listener {
		public function onEnable() {
			new Config($this->getDataFolder()."config.yml", Config::YAML, [
				"jasonwynn10" => [
					"74.141.54.178"
				]
			]);
			$this->getConfig()->reload();
			$this->getServer()->getPluginManager()->registerEvents($this, $this);
		}

		/**
		 * @priority HIGHEST
		 * @ignoreCancelled true
		 *
		 * @param PlayerPreLoginEvent $ev
		 */
		public function onPreLogin(PlayerPreLoginEvent $ev) {
			if($ev->isCancelled())
				return;
			$player = $ev->getPlayer();
			if($this->getConfig()->exists($player->getName())) {
				if(empty($this->getConfig()->get($player->getName(), []))) {
					$this->getConfig()->set($player->getName(), [$player->getAddress()]);
				}else{
					if(!in_array($player->getAddress(), $this->getConfig()->get($player->getName()))) {
						$ev->setCancelled();
						$ev->setKickMessage("This username can only join from a few set IP addresses.\nNo hacking accounts here :P");
					}
				}
			}
		}
	}
}