MatthiasMullie\Scrapbook\Psr6\Item::__construct PHP Method

    public function __construct($key, Repository $repository)
    {
        $this->key = $key;
        /*
         * Register this key (tied to this particular object) to the value
         * repository.
         *
         * If 1 key is requested multiple times, the value could be an object
         * that could be altered (by reference) and if all objects-for-same-key
         * reference that same value, all would've been changed (because all
         * would be that exact same value.)
         *
         * I'm using spl_object_hash to get a unique identifier linking $key to
         * this particular object, without using this object itself (I could use
         * SplObjectStorage.) If I stored this object, it wouldn't be destructed
         * when it's no longer needed, and I want it to destruct so I can free
         * up this value in the repository when it's no longer needed.
         */
        $this->repository = $repository;
        $this->hash = spl_object_hash($this);
        $this->repository->add($this->hash, $this->key);
    }