code: public function clickLink($label, $index = 0)
      {
          $url = $this->getLink($label, $index);
          if ($url === false) {
              return false;
          }
  
          $this->load($url, new SimpleGetEncoding());
  
          return (bool) $this->getContent();
      }
docs: Follows a link by label.
  Will click the first link found with this link text by default,
  or a later one, if an index is given.
  The match ignores case and white space issues.
  
  @param string $label     Text between the anchor tags.
  @param int $index    Link position counting from zero.
  
  @return boolean   True on success.