pocketmine\tile\Chest::createPair PHP Method

    private function createPair(Chest $tile)
    {
        $this->namedtag->pairx = new IntTag("pairx", $tile->x);
        $this->namedtag->pairz = new IntTag("pairz", $tile->z);
        $tile->namedtag->pairx = new IntTag("pairx", $this->x);
        $tile->namedtag->pairz = new IntTag("pairz", $this->z);
    }