正如标题所述，我试图从一个经常更改的外部JSON API填充我的主菜单，因此我需要整个菜单是动态的。我成功地插入了如下API：

$content = file_get_contents( \'https://www.motobuykers.es/apih/menus/desktop/\' );
$json    = json_decode( $content );

$menuname     = \'Test\';
$menulocation = \'primary\';

// Does the menu exist already?
$menu_exists = wp_get_nav_menu_object( $menuname );

// If it doesn\'t exist, let\'s create it.
if ( ! $menu_exists ) {

    $menu_id = wp_create_nav_menu( $menuname );

    foreach ( $json->_embedded->menuitem as $menuitem ) {
        wp_update_nav_menu_item( $menu_id, 0, array(
            \'menu-item-title\'   => $menuitem->title,
            \'menu-item-classes\' => $menuitem->class,
            \'menu-item-url\'     => $menuitem->url,
            \'menu-item-status\'  => \'publish\'
        ) );
    }

    if ( ! has_nav_menu( $menulocation ) ) {
        $locations                  = get_theme_mod( \'nav_menu_locations\' );
        $locations[ $menulocation ] = $menu_id;
        set_theme_mod( \'nav_menu_locations\', $locations );
    }

}

这段代码的问题是，一旦我创建了菜单，就不能再从API更新它了。我也试着use Daggerhart\'s solution, 但下一个代码段中的foreach返回：

警告：为foreach（）提供的参数无效

尽管我传递的JSON与第一个片段完全相同：

function custom_nav_menu_items( $items, $menu ) {

    // only add item to a specific menu
    if ( $menu->slug == \'menu-1\' ) {

        //if (is_array($json->_embedded->menuitem)) {
        //if (is_array($values) || is_object($values)){

        foreach ( $json->_embedded->menuitem as $menuitem ) {
            $items[] = _custom_nav_menu_item( $menuitem->name, $menuitem->url, addID() );
        }

        return $items;
    }

}

add_filter( \'wp_get_nav_menu_items\', \'custom_nav_menu_items\', 20, 2 );

有什么想法吗？