how to use a event?

What event should I use? Here is the code:

PHP:

use pocketmine\event\player\PlayerDeathEvent;

//my code//kits
public function onPlayerDeath(PlayerDeathEvent $event){
        if(isset($this->sessions[$event->getEntity()->getName()])){
            unset($this->sessions[$event->getEntity()->getName()]);
        }
    }

I can not solve this problem by killing the whale-start is not possible to receive and dying whale start again turns.

Sorry, my bad English.

Use in_array instead of isset and $event->getPlayer()->getName(). Also, did you register the Event?

Why? How do you know that he didn't intend to use names as keys?

And it should be $event->getEntity(). Don't reply unless you are sure it is correct.

And how come someone liked that post?