MongoHybrid\Client::hincrby PHP Method

    public function hincrby($collection, $key, $field, $by = 1)
    {
        $current = $this->hget($collection, $key, $field, 0);
        $newone = $current + $by;
        $this->hset($collection, $key, $field, $newone);
        return $newone;
    }