Player changeLevel

How to use EntityLevelChangeEvent the event to write player changed message ~

 

PHP:

public function onEntityLevelChange(EntityLevelChangeEvent $event) {
  $entity = $entity->getEntity();
  if($entity instanceof Player) {
    //message

  }

}

 

I want to know the original world and the transformed world.

 

Your answer was in the question. I just looked at EntityLevelChangeEvent.php, and found these functions.