MatthiasMullie\Scrapbook\Adapters\MemoryStore::increment PHP Method

    public function increment($key, $offset = 1, $initial = 0, $expire = 0)
    {
        if ($offset <= 0 || $initial < 0) {
            return false;
        }
        return $this->doIncrement($key, $offset, $initial, $expire);
    }