How to create a Drupal theme compatible for bootstrap menu

if ($element['#below']) {

// Prevent dropdown functions from being added to management menu as to not affect 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']);
$sub_menu = '<ul class="dropdown dropdown-menu">' . drupal_render($element['#below']) . '</ul>';
$element['#localized_options']['attributes']['class'][] = 'dropdown-toggle';
//$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'] .= ' ';
}

// Set dropdown trigger element to # to prevent inadvertant page loading with submenu click
$element['#localized_options']['attributes']['data-target'] = '#';
}
}
// Issue #1896674 – On primary navigation menu, class 'active' is not set on active menu item.
// @see http://drupal.org/node/1896674
if (($element['#href'] == $_GET['q'] || ($element['#href'] == '<front>' && 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";
}