Snowball Debuff when hits entity

PHP:


public function onDamage(EntityDamageEvent $event) {
        $victim = $event->getEntity();
        $cause = $event->getCause();
           
            if($cause == EntityDamageEvent::PROJECTILE){
                if($victim instanceof Player){
                    $killer = $event->getDamager();


I dont know if Im even close. Am I correct on this? I know I have to check if the player was hit by a projectile get the victim and add a desired debuff to him but can you guys help me? Im stuck dont know if this is close to right

 

Use CAUSE_PROJECTILE instead

 

If the cause is EntityDamageEvent::CAUSE_PROJECTILE, you'll need to handle the next step in two divisions.

PHP:

//if cause = EntityDamageEvent::CAUSE_PROJECTILE
$killer = null;
if($event instanceof EntityDamageByChildEntityEvent){
    $projectile = $event->getChild();
    $killer = $event->getDamager();
}else{
    $projectile = $event->getDamager();
}

if($projectile instanceof Snowball){//pocketmine\entity\projectile\Snowball
    //...
}


Yes, $killer can be null. It's null if the killer launched the projectile and quit the game, and the projectile later hits another entity.