Cactus collision damage won't cancel

Hi, i tryed to remove cactus damage but that's not working, i don't know why:

PHP:

    public function onDamage(EntityDamageEvent $e)
    {
        $level = $e->getEntity()->getLevel()->getFolderName();
        $entity = $e->getEntity();

        $cause[0] = $e->getCause();
        $cause[1] = $entity->getLastDamageCause();
        $cause[2] = $entity->getLastDamageCause()->getCause();

        if ($entity instanceof Player) {
            switch ($level) {
                case 'world':

                    #General damage event
                    switch ($cause[0]) {
                        case array_key_exists($cause, $this->causes):
                            $e->setCancelled();
                            break;
                    }

                    #Specified block contact
                    switch ($cause[2]) {

                        case EntityDamageEvent::CAUSE_CONTACT:

                            if ($cause[1] instanceof EntityDamageByBlockEvent) {
                                $cause[3] = $cause[1]->getDamager();

                                switch ($cause[3]->getId()) {
                                    case Block::CACTUS:
                                        $e->setCancelled();
                                        break;

                                    case Block::TNT:
                                        $e->setCancelled();
                                        break;
                                }
                            }
                    }
            }
        }
    }

My array is:

PHP:

public $causes = array(EntityDamageEvent::CAUSE_CONTACT, EntityDamageEvent::CAUSE_ENTITY_ATTACK, EntityDamageEvent::CAUSE_PROJECTILE);

 

Why you use array_key_exists when $this->causes does not contains any keys?

PHP:

  public function onDamage(EntityDamageEvent $e)
    {
        $level = $e->getEntity()->getLevel()->getFolderName();
        $entity = $e->getEntity();

        if ($entity instanceof Player) {
            switch ($level) {
                case 'world':
                if(in_array($e->getCause(), $this->causes)){
                     $e->setCancelled();
               }
            }
        }
    }

 

I'vee never seen someone who likes soo much the switch function