pocketmine\entity\Effect::remove PHP Method

    public function remove(Entity $entity)
    {
        if ($entity instanceof Player) {
            $pk = new MobEffectPacket();
            $pk->eid = 0;
            $pk->eventId = MobEffectPacket::EVENT_REMOVE;
            $pk->effectId = $this->getId();
            $entity->dataPacket($pk);
            if ($this->id === Effect::SPEED) {
                $attr = $entity->getAttributeMap()->getAttribute(Attribute::MOVEMENT_SPEED);
                $attr->setValue($attr->getValue() / (1 + 0.2 * ($this->amplifier + 1)));
            } elseif ($this->id === Effect::SLOWNESS) {
                $attr = $entity->getAttributeMap()->getAttribute(Attribute::MOVEMENT_SPEED);
                $attr->setValue($attr->getValue() / (1 - 0.15 * ($this->amplifier + 1)));
            }
        }
        if ($this->id === Effect::INVISIBILITY) {
            $entity->setDataFlag(Entity::DATA_FLAGS, Entity::DATA_FLAG_INVISIBLE, false);
            $entity->setDataProperty(Entity::DATA_SHOW_NAMETAG, Entity::DATA_TYPE_BYTE, 1);
        }
    }