Drupal 7 navigation bar

可输出二级子菜单

      if (module_exists('i18n_menu')) {
        $main_menu_tree = i18n_menu_translated_tree(variable_get('menu_main_links_source', 'main-menu'));
    } else {
        $main_menu_tree = menu_tree(variable_get('menu_main_links_source', 'main-menu'));
    }
    print drupal_render($main_menu_tree);
  endif; ?>

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