Why doesn't this work?

I was testing out my code to see if killing a player outputs a message to killer and the code isn't working. I registered the PlayerDeathEvent and etc. I am not sure why it isn't working... No errors popup or crashes happen as well.

PHP:

public function onDeath(PlayerDeathEvent $event) {
        $entity = $event->getEntity();
        $cause = $entity->getLastDamageCause();
    
        if($cause instanceof EntityByDamageEntityEvent) {
            $player = $cause->getDamager()->getPlayer();
            $player->sendMessage("You killed....");
        }
    }
}

I also tried this, it checks the killer is a instance of player, but the code doesn't work either.

PHP:

public function onDeath(PlayerDeathEvent $event) {
        $entity = $event->getEntity();
        $cause = $entity->getLastDamageCause();
    
        if($cause instanceof EntityByDamageEntityEvent) {
            $player = $cause->getDamager()->getPlayer();
            if($player instanceof) {
                $player->sendMessage("You killed....");
            }
        }
}

Add 'Player' after Insteancedof

PHP:

public function onPlayerDeathEvent(PlayerDeathEvent $event)
        {
            $player = $event->getEntity();
            $name = strtolower($player->getName());
      
            if ($player instanceof Player)
            {
                $cause = $player->getLastDamageCause();
      


Try this.

PHP:

public function onDeath(PlayerDeathEvent $event) {
    $entity = $event->getEntity();
    if($entity instanceof Player){
       $cause = $entity->getLastDamageCause();
       if($cause instanceof EntityDamageByEntityEvent){
          $player = $cause->getDamager();
          if($player instanceof Player){
             $player->sendMessage("You killed....");
          }
       }
    }
}


Why $name?

It is EntityDamageByEntityEvent.

PHP:

public funciton onDeath(PlayerDeathEvent $event){
  $entity = $event->getEntity();
  $cause = $entity->getLastDamageCause();
  if($cause instanceof EntityDamageByEntityEvent){
    $player = $cause->getDamager(); // getPlayer() is not needed! Where did you learn this? This is just wrong!
    if($player instanceof Player){
      $player->sendMessage("You killed " . $entity->getName());
    }
  }
}

Is an example

I forgot that, but it is fixed in the plugin itself.

I saw it in another plugin. Also thanks a lot.