pocketmine\MemoryManager::addObjectWatcher PHP Method

    public function addObjectWatcher($object)
    {
        if (!is_object($object)) {
            throw new \InvalidArgumentException("Not an object!");
        }
        $identifier = spl_object_hash($object) . ":" . get_class($object);
        if (isset($this->leakInfo[$identifier])) {
            return $this->leakInfo["id"];
        }
        $this->leakInfo[$identifier] = ["id" => $id = md5($identifier . ":" . $this->leakSeed++), "class" => get_class($object), "hash" => $identifier];
        $this->leakInfo[$id] = $this->leakInfo[$identifier];
        $this->leakWatch[$id] = new \WeakRef($object);
        return $id;
    }