Validation issue with zen_back_link

[lat9]

If the back-link determined by zen_back_link (in /includes/functions/functions_general.php) contains an ampersand, the resulting HTML does not validate. Here's a change that corrects the problem:

  function zen_back_link($link_only = false) {
    if (sizeof($_SESSION['navigation']->path)-2 >= 0) {
      $back = sizeof($_SESSION['navigation']->path)-2;
      $link = zen_href_link($_SESSION['navigation']->path[$back]['page'], zen_array_to_string($_SESSION['navigation']->path[$back]['get'], array('action')), $_SESSION['navigation']->path[$back]['mode']);
    } else {
      if (isset($_SERVER['HTTP_REFERER']) && preg_match("~^".HTTP_SERVER."~i", $_SERVER['HTTP_REFERER']) ) {
      //if (isset($_SERVER['HTTP_REFERER']) && strstr($_SERVER['HTTP_REFERER'], str_replace(array('http://', 'https://'), '', HTTP_SERVER) ) ) {
        $link= $_SERVER['HTTP_REFERER'];
      } else {
        $link = zen_href_link(FILENAME_DEFAULT);
      }
      $_SESSION['navigation'] = new navigationHistory;
    }

    $link = str_replace('&', '&', $link);

    if ($link_only == true) {
      return $link;
    } else {
      return '<a href="' . $link . '">';
    }
  }