Simple ice bucket challenge plugin in PocketMine/ModPE xD

IceBucketChallenge.js

var others = [
	"sheep",
	"pig",
	"cow",
	"chicken",
	"zombie",
	"skeleton",
	"spider",
	"creeper",
	"zombie pigman",
	"mooshroom",
	"wolf",
	"slime",
	"silverfish",
	"enderman"
];
function useItem(x, y, z, item, block){
	if(block == 79){
		var damage = Player.getCarriedItemData();
		if(item == 325){
			if(damage == 0){
				Level.setTile(Player.getX(), Player.getY() + 1, Player.getZ(), 9);
				Level.setTile(Player.getX(), Player.getY(), Player.getZ(), 79);
				var msg = "You have accepted the ice bucket challenge! Now, nominate " + getThreeRandom() + "!";
				clientMessage(msg);
			}
		}
	}
}
function getThreeRandom(){
	var clone = others;
	var out = "";
	var i0 = getRandomIn(clone);
	out += clone[i0];
	out += ", ";
	clone = unshiftFromArray(clone, i0);
	var i1 = getRandomIn(clone);
	out += clone[i1];
	out += " and ";
	clone = unshiftFromArray(clone, i1);
	out += arr[getRandomIn(clone)];
	return out;
}
function getRandomIn(arr){
	var rand = Math.random();
	rand *= arr.length;
	return rand;
}
function unshiftFromArray(arr, id){
	var ret = [];
	for(var i = 0; i < arr.length; i++){
		if(i != id){
			ret[ret.length] = arr[i];
		}
	}
	return ret;
}

IceBucketChallenge.php

<?php

namespace pemapmodder\icebucketchallenge;

use pocketmine\Player;
use pocketmine\block\Air;
use pocketmine\block\Block;
use pocketmine\event\Listener;
use pocketmine\event\entity\EntityDamageByEntityEvent;
use pocketmine\event\player\PlayerInteractEvent;
use pocketmine\item\Item;
use pocketmine\plugin\PluginBase;

class IceBucketChallenge extends PluginBase implements Listener{
	/** int[][] */
	private $ibc = [];
	public function onEnable(){
		$this->getServer()->getPluginManager()->registerEvents($this, $this);
	}
	public function onInteract(PlayerInteractEvent $ev){
		$it = $ev->getItem();
		if($it->getID() === Item::BUCKET and $it->getDamage() === 0){
			$it->setDamage(8);
			$p = $ev->getPlayer();
			$this->ibc[$p->getName()][$p->getInventory()->getHeldItemSlot()] = true;
			$p->sendMessage("You have selected the ice bucket!");
			$p->getLevel()->setBlock($ev->getBlock(), new Air, true, false);
			$ev->setCancelled();
		}
		elseif($it->getID() === Item::BUCKET and $it->getDamage() === 8){
			if(isset($this->ibc[$ev->getPlayer()->getName()][$ev->getPlayer()->getInventory()->getHeldItemSlot()])){
				$ev->setCancelled();
				$ev->getPlayer()->sendMessage("Send the ice bucket out!");
			}
		}
	}
	public function onHit(EntityDamageByEntityEvent $ev){
		$damager = $ev->getDamager();
		$victim = $ev->getEntity();
		if(($damager instanceof Player) and ($victim instanceof Player)){
			if(isset($this->ibc[$damager->getName()][$slot = $damager->getInventory()->getHeldItemSlot()])){
				$item = $damager->getInventory()->getItem($slot);
				if($item->getID() === Item::BUCKET and $item->getDamage() === 8){
					$ev->setCancelled();
					$this->getServer()->broadcastMessage($victim->getName() . " has accepted the ice bucket challenge!");
					$victim->getLevel()->setBlock($victim, Block::get(9), true, false);
					unset($this->ibc[$damager->getName()][$slot]);
					$damager->getInventory()->getItem($slot)->setDamage(0);
				}
				else{
					unset($this->ibc[$damager->getName()][$slot]); // :( won't track the bucket
				}
			}
		}
	}
}

Test it ;)

Why? lol