自2014年这里的答案发布以来，WordPress的功能发生了变化。

从今天起（版本4.6.1），此代码将创建一个名为“我的菜单”、主项和子项的主菜单。

要运行代码，只需粘贴并保存在函数中即可。您的child theme.

$menu_id = wp_create_nav_menu(\'My Menu\');

$parent_item = wp_update_nav_menu_item($menu_id, 0, array(
    \'menu-item-title\' =>  __(\'Main Page\'),
    \'menu-item-url\' => home_url( \'/main-page/\' ), 
    \'menu-item-status\' => \'publish\', 
    )
);

wp_update_nav_menu_item($menu_id, 0, array(
    \'menu-item-title\' =>  __(\'Sub Item Page\'),
    \'menu-item-url\' => home_url( \'/sub-item-page/\' ), 
    \'menu-item-status\' => \'publish\', 
    \'menu-item-parent-id\' => $parent_item)
);

• wp_create_nav_menu
• wp_update_nav_menu_item

您的代码可能如下所示

    add_filter( \'wp_nav_menu_objects\', \'ravs_add_menu_parent_class\' );
    function ravs_add_menu_parent_class( $items ) {
      foreach ( $items as $item ) {
       print_r($item);//print each menu item an get your parent menu item-id
      }
      $link = array (
            \'title\'            => \'Cats\',
            \'menu_item_parent\' => id of Animals menu like 1372,
            \'ID\'               => \'\',
            \'db_id\'            => \'\',
            \'url\'              => \'www.google.com\'
        );
      $items[] = (object) $link;
      return $items;    
    }

利奥，

Ravs向现有WP\\U Post\\U对象添加子导航是正确的，但如果您正在创建导航项目，然后想要向其添加子导航，则必须设置导航项目的db\\U id：

add_filter( \'wp_nav_menu_objects\', \'ravs_add_menu_parent_class\' );
function ravs_add_menu_parent_class( $items ) {
    $animals = array (
        \'title\'            => \'Animals\',
        \'menu_item_parent\' => 0,
        \'ID\'               => 999999999999876, //an unlikely, high number
        \'db_id\'            => 999999999999876, //an unlikely, high number
        \'url\'              => \'www.google.com?s=animals\'
    );
    $items[] = (object) $animals;

    $cats = array (
        \'title\'            => \'Cats\',
        \'menu_item_parent\' => 999999999999876,
        \'ID\'               => \'\',
        \'db_id\'            => \'\',
        \'url\'              => \'www.google.com/?s=cats\'
    );
    $items[] = (object) $cats ;

    return $items;    
}