pocketmine\entity\Entity::removeEffect PHP Method

    public function removeEffect($effectId)
    {
        Server::getInstance()->getPluginManager()->callEvent($ev = new EntityEffectRemoveEvent($this, $effectId));
        if ($ev->isCancelled()) {
            return false;
        }
        if (isset($this->effects[$effectId])) {
            $effect = $this->effects[$effectId];
            unset($this->effects[$effectId]);
            $effect->remove($this);
            if ($effectId === Effect::ABSORPTION and $this instanceof Human) {
                $this->setAbsorption(0);
            }
            $this->recalculateEffectColor();
            return true;
        }
    }