set item durability (damage)

I want to make a unbreaking effect, so when player attack/break something, the item durability (damage) won't change:
this is my code:
I not sure this code is working or not, I think it still have bugs,

PHP:

public function onDamage(EntityDamageEvent $event) {

      if($event->getDamager() instanceof Player && !$event->isCancelled()){

   $item = $event->getDamager()->getInventory()->getIteminHand();

          switch($item->getId()){

              case 267:

              case 268:

              case 272:

              case 276:

                 // $item->setDamage($item->getDamage() + 1);
                      $item->setDamage($item->getDamage() - 1 );

                  break;

              default:

                  }

              }

        }

Set damage to 0?

Why +1? If the damage is higher, the durability goes down.

eh, I forget =_=

EntityDamageEvent didn't necessarily have getDamager function. Only EntityDamageByEntityEvent does.

I remember now, so how to set item durability (BlockBreakEvent and EntityDamageByEntityEvent ?)

Try doing $player->getInventory()->sendSlot($player->getInventory()->getHeldItemSlot(), $player); after setDamage

Like: ?

PHP:

public function onHurt(EntityDamageByEntityEvent $event) {
      if($event->getDamager() instanceof Player && !$event->isCancelled()){
      $item = $event->getDamager()->getInventory()->getIteminHand();
          switch($item->getId()){
              case 267:
              case 268:
              case 272:
              case 276:
                $item->setDamage($item->getDamage() - 1);
                $event->getDamager()->getInventory()->sendSlot($event->getDamager()->getInventory()->getHeldItemSlot(), $event->getDamager());
                  }
              }
        }


Who is $damager?

And I try:

PHP:

       public function BreakEvent(BlockBreakEvent $event){

            if($event->getPlayer() instanceof Player && !$event->isCancelled()){

                $item = $event->getItem();

                $player = $event->getPlayer();

                switch($id){

                    case 267:

                    case 268:

                    case 272:

                    case 276:

               $item->setDamage($item->getDamage() - 1);

              $player->getInventory()->sendSlot($player->getInventory()->getHeldItemSlot(), $player);

                }

            }

        }



How many times have I said that... Don't handle EntityDamageByEntityEvent, only EntityDamageEvent...

But I can't get Damager in EntityDamageEvent
:
public function onHurt(EntityDamageEvent $event) {

if ($event instanceof EntityDamageByEntityEvent) {

There you go, you can use getDamager after you have confirmed it is an instance of EntityDamageByEntityEvent.