GraphQL\Utils\PairSet::pairSetAdd PHP Метод

    private function pairSetAdd($a, $b)
    {
        $a = $this->toObj($a);
        $b = $this->toObj($b);
        $set = isset($this->data[$a]) ? $this->data[$a] : null;
        if (!isset($set)) {
            $set = new \SplObjectStorage();
            $this->data[$a] = $set;
        }
        $set[$b] = true;
    }