Symfony\Component\DomCrawler\Crawler::addHtmlContent PHP Method

    public function addHtmlContent($content, $charset = 'UTF-8')
    {
        $internalErrors = libxml_use_internal_errors(true);
        $disableEntities = libxml_disable_entity_loader(true);
        $dom = new \DOMDocument('1.0', $charset);
        $dom->validateOnParse = true;
        set_error_handler(function () {
            throw new \Exception();
        });
        try {
            // Convert charset to HTML-entities to work around bugs in DOMDocument::loadHTML()
            $content = mb_convert_encoding($content, 'HTML-ENTITIES', $charset);
        } catch (\Exception $e) {
        }
        restore_error_handler();
        if ('' !== trim($content)) {
            @$dom->loadHTML($content);
        }
        libxml_use_internal_errors($internalErrors);
        libxml_disable_entity_loader($disableEntities);
        $this->addDocument($dom);
        $base = $this->filterRelativeXPath('descendant-or-self::base')->extract(array('href'));
        $baseHref = current($base);
        if (count($base) && !empty($baseHref)) {
            if ($this->baseHref) {
                $linkNode = $dom->createElement('a');
                $linkNode->setAttribute('href', $baseHref);
                $link = new Link($linkNode, $this->baseHref);
                $this->baseHref = $link->getUri();
            } else {
                $this->baseHref = $baseHref;
            }
        }
    }

 /**
  * Process the DOM
  *
  * @return array
  * @throws Exception
  */
 public function process()
 {
     // Check if HTML content is already set
     $this->checkIfContentIsEmpty($this->html);
     $items = [];
     $total = 0;
     $prepareItems = function (Crawler $nodeCrawler, $i) use(&$items, &$total) {
         $title = $nodeCrawler->filter('h3 > a');
         $link = $nodeCrawler->filter('h3 > a')->attr('href');
         $price = $nodeCrawler->filter('p.pricePerUnit')->text();
         $descriptionPage = $this->fetch($link);
         //prepare items array
         $items[$i]['title'] = trim($title->text());
         $items[$i]['size'] = $this->sizeOf($descriptionPage);
         $items[$i]['unit_price'] = $this->format($price);
         $items[$i]['description'] = $this->getDescriptionFor($descriptionPage);
         $total += $items[$i]['unit_price'];
     };
     // bind the closure to the object context
     // so we can access the object inside the closure
     $prepareItems->bindTo($this);
     $this->domCrawler->addHtmlContent($this->html);
     $this->domCrawler->filter('ul.productLister > li')->each($prepareItems);
     $this->items = $items;
     $this->total = number_format($total, 2);
     unset($items);
     unset($total);
     return ['items' => $this->items, 'total' => $this->total];
 }