WordPress的获取顶级菜单项目标题

Question

我正在开发WP主题，我想要的是当前顶级项目的sidebare上的导航。

• 菜单项
  • 子菜单项
    • Subsubmenu项目
    • Subsubmenu项目
    • Subsubmenu项目
  • 子菜单项
    • Subsubmenu项目
    • Subsubmenu项目
    • Subsubmenu项目
  • 子菜单项
    • Subsubmenu项目
    • Subsubmenu项目
    • Subsubmenu项目

请在侧边栏上看到下面的代码，除了“Menu Item（top parent）”。你知道如何实现这个？

// add hook 
add_filter('wp_nav_menu_objects', 'my_wp_nav_menu_objects_sub_menu', 10, 2); 

// filter_hook function to react on sub_menu flag 
function my_wp_nav_menu_objects_sub_menu($sorted_menu_items, $args) { 
    if (isset($args->sub_menu)) { 
    $root_id = 0; 

    // find the current menu item 
    foreach ($sorted_menu_items as $menu_item) { 
     if ($menu_item->current) { 
     // set the root id based on whether the current menu item has a parent or not 
     $root_id = ($menu_item->menu_item_parent) ? $menu_item->menu_item_parent : $menu_item->ID; 
     break; 
     } 
    } 

    // find the top level parent 
    if (! isset($args->direct_parent)) { 
     $prev_root_id = $root_id; 
     while ($prev_root_id != 0) { 
     foreach ($sorted_menu_items as $menu_item) { 
      if ($menu_item->ID == $prev_root_id) { 
      $prev_root_id = $menu_item->menu_item_parent; 
      // don't set the root_id to 0 if we've reached the top of the menu 
      if ($prev_root_id != 0) $root_id = $menu_item->menu_item_parent; 
      break; 
      } 
     } 
     } 
    } 

    $menu_item_parents = array(); 

    foreach ($sorted_menu_items as $key => $item) { 
     // init menu_item_parents 
     if ($item->ID == $root_id) $menu_item_parents[] = $item->ID; 

     if (in_array($item->menu_item_parent, $menu_item_parents)) { 
     // part of sub-tree: keep! 
     $menu_item_parents[] = $item->ID; 
     } else if (! (isset($args->show_parent) && in_array($item->ID, $menu_item_parents))) { 
     // not part of sub-tree: away with it! 
     unset($sorted_menu_items[$key]); 
     } 
    } 
    return $sorted_menu_items; 
    } else { 
    return $sorted_menu_items; 
    } 
} 

With echo $ root_id; 我能够获得根菜单项ID，但我想显示标题。

这是我在侧边栏

<section class="widget widget_navbar"> 
    <?php 
    if (has_nav_menu('primary_navigation')) : 
    wp_nav_menu([ 
     'theme_location' => 'primary_navigation', 
     'sub_menu'  => true, 

    ]); 
    endif; 
    ?> 

</section> 

Answer 1

该过滤器的作者的代码 - 基督教瓦尔加 - 这里有指示：https://gist.github.com/levymetal/5547605#file-show_parent-php。原来的博客帖子是这样的：https://christianvarga.com/how-to-get-submenu-items-from-a-wordpress-menu-based-on-parent-or-sibling/

wp_nav_menu(array(
    'theme_location' => 'primary', 
    'sub_menu'  => true, 
    'show_parent' => true // this shows the parent 
));