我创建了这两个函数，您可以使用它们向菜单中的给定菜单项添加自定义项（页面、帖子、链接…）。

在您的情况下，可以将这些函数添加到functions.php 这样称呼他们：

$menu_name = \'Your Menu Name\';
$name_of_menu_item_to_append_to = \'My Account\';
$id_of_menu_item_to_append_to =  get_wp_object_id( $name_of_menu_item_to_append_to, \'nav_menu_item\' );
$new_submenu_item = array(
    \'text\' => \'Profile\',
    \'url\'  => \'http://someurl.com\'
);

add_subitems_to_menu( 
    $menu_name,
    $id_of_menu_item_to_append_to,
    array( $new_submenu_item ) 
);

add_subitems_to_menu()

/**
 * Adds custom items to a navigation menu
 * Partially based on: 
 * http://teleogistic.net/2013/02/dynamically-add-items-to-a-wp_nav_menu-list/
 * 
 * @param string    $menu_name          The name or slug of the navigation menu
 * @param int       $parent_object_id   The id of the post/page, which must be present 
 *                                      in the menu, and to which we want to add subitems 
 * @param array     $subitems           The sub-items to be added to the menu, as an
 *                                      array( array( \'text\' => \'foo\', \'url\' => \'/bar\') )
 */
public function add_subitems_to_menu( $menu_name, $parent_object_id, $subitems ) {
    // Don\'t add anything in admin area. Otherwise WP will try to display the items in the 
    // Menu editor and it won\'t work fine and cause strange behaviour
    if ( is_admin() ) {
        return;
    }

    // Use wp_get_nav_menu_items filter, is used by Timber to get WP menu items
    add_filter( \'wp_get_nav_menu_items\', function( $items, $menu ) 
            use( $menu_name, $parent_object_id, $subitems ) {

        // If no menu found, just return the items without adding anything
        if ( $menu->name != $menu_name && $menu->slug != $menu_name ) {
            return $items;
        }

        // Find the menu item ID corresponding to the given post/page object ID
        // If no post/page found, the subitems won\'t have any parent (will be on 1st level)
        $parent_menu_item_id = 0;
        foreach ( $items as $item ) {
            if ( $parent_object_id == $item->object_id ) {
                $parent_menu_item_id = $item->ID;
                break;
            }
        }

        $menu_order = count( $items ) + 1;

        foreach ( $subitems as $subitem ) {
            // Create objects containing all (and only) those properties from WP_Post 
            // used by WP to create a menu item
            $items[] = (object) array(
                \'ID\'                => $menu_order + 1000000000, // ID that WP won\'t use
                \'title\'             => $subitem[\'text\'],
                \'url\'               => $subitem[\'url\'],
                \'menu_item_parent\'  => $parent_menu_item_id,
                \'menu_order\'        => $menu_order,
                // These are not necessary, but PHP warning will be thrown if undefined
                \'type\'              => \'\',
                \'object\'            => \'\',
                \'object_id\'         => \'\',
                \'db_id\'             => \'\',
                \'classes\'           => \'\',
            );
            $menu_order++;
        }
        return $items;
    }, 10, 2);
}

get_wp_object_id()

 /**
 * Returns the WordPress ID of any post type or page by its title or name
 * In the case you provide an ID it will "validate" it looking for any post with that ID
 *
 * @param mixed     $post_identifier    The title, name or ID of the post/page
 * @param string    $post_type          The post type to look for (default: page)
 *
 * @return int The ID of the post/page if any, or 0
 */
public function get_wp_object_id( $post_identifier, $post_type = \'page\' ) {

    $post_id = 0;

    if ( get_page_by_title( $post_identifier, OBJECT, $post_type ) ) {
        $post_id = get_page_by_title( $post_identifier, OBJECT, $post_type )->ID;
    }
    else if ( get_page_by_path( $post_identifier, OBJECT, $post_type ) ) {
        $post_id = get_page_by_path( $post_identifier, OBJECT, $post_type )->ID;
    }
    else if ( get_post( $post_identifier ) ) {
        $post_id = get_post( $post_identifier )->ID;
    }

    return $post_id;
}