closeFile example

    public function writeFile(Shop $shop, array $urls = [])
    {
        if (empty($urls)) {
            return false;
        }

        $this->openFile($shop->getId());

        foreach ($urls as $url) {
            if ($this->files[$shop->getId()]['urlCount'] >= self::SITEMAP_URL_LIMIT) {
                $this->closeFile($shop->getId());

                $this->openFile($shop->getId());
            }

            ++$this->files[$shop->getId()]['urlCount'];
            $this->write($this->files[$shop->getId()]['fileHandle'], (string) $url);
        }

        return true;
    }