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

    public function getNode($position)
    {
        if (isset($this->nodes[$position])) {
            return $this->nodes[$position];
        }
    }

 /**
  * Returns DOMElement from crawler instance.
  *
  * @param Crawler $crawler
  *
  * @return \DOMElement
  *
  * @throws DriverException when the node does not exist
  */
 private function getCrawlerNode(Crawler $crawler)
 {
     $node = null;
     if ($crawler instanceof \Iterator) {
         // for symfony 2.3 compatibility as getNode is not public before symfony 2.4
         $crawler->rewind();
         $node = $crawler->current();
     } else {
         $node = $crawler->getNode(0);
     }
     if (null !== $node) {
         return $node;
     }
     throw new DriverException('The element does not exist');
 }