Dropdown Menu

I have find someone write the "Drop down menu" in other style and successful to use.

Here is the link :
http://www.nybergtechnology.com/blog/2013/11/11/druapl-7-dropdown-menu-u...

I have cleanup some code and look like below :

<?php
/**
 * @file
 * menu-link.func.php
 */

/**
 * Overrides theme_menu_link().
 */
function bootstrap_menu_link(array $variables) {
  $element = $variables['element'];
  $sub_menu = '';

  if ($element['#below']) {
    // Prevent dropdown functions from being added to management menu so it
    // does not affect the navbar module.
    if (($element['#original_link']['menu_name'] == 'management') && (module_exists('navbar'))) {
      $sub_menu = drupal_render($element['#below']);
    }
    else {
      // Add our own wrapper.
      unset($element['#below']['#theme_wrappers']);
      $sub_menu = '';
      // Generate as standard dropdown.
      $element['#localized_options']['attributes']['class'][] = 'dropdown-toggle';
      $element['#localized_options']['attributes']['data-toggle'] = 'dropdown';

      // Check if this element is nested within another
      if ((!empty($element['#original_link']['depth'])) && ($element['#original_link']['depth'] > 1)) {
        // Generate as dropdown submenu
        $element['#attributes']['class'][] = 'dropdown-submenu';
      }

      else {
        // Generate as standard dropdown
        $element['#attributes']['class'][] = 'dropdown';
        $element['#localized_options']['html'] = TRUE;
        $element['#title'] .= '<span class="caret"></span>';
      }



      // Set dropdown trigger element to # to prevent inadvertant page loading
      // when a submenu link is clicked.
      $element['#localized_options']['attributes']['data-target'] = '#';
    }
  }
  // On primary navigation menu, class 'active' is not set on active menu item.
  // @see https://drupal.org/node/1896674
  if (($element['#href'] == $_GET['q'] || ($element['#href'] == '' && drupal_is_front_page())) && (empty($element['#localized_options']['language']) || $element['#localized_options']['language']->language == $language_url->language)) {
    $element['#attributes']['class'][] = 'active';
  }
  $output = l($element['#title'], $element['#href'], $element['#localized_options']);
  return '<li' . drupal_attributes($element['#attributes']) . '>' . $output . $sub_menu . "</li>\n";
}

Is there any can improve or any other idea?