这有点晚了，但我必须自己找出这个问题的另一部分，并想与大家分享。

要创建默认菜单并将其放置到主题位置，您需要在主题中预先存在一个位置，并且需要确保您在菜单中链接的任何页面也已创建。

在主题的功能中。php，注册任何菜单位置。我注册了两个：

function my_register_navs() {
    register_nav_menus(
        array( \'header-menu\' => __( \'Header Menu\' )
        , \'footer-menu\' => __( \'Footer Menu\' ) )
    );
}
add_action( \'init\', \'my_register_navs\' );

// Create the menus
$hdr_menu = array(
    \'menu-name\'     => \'Header Menu\'
    , \'description\' => \'The primary navigation menu for this website\'
);
$header_menu = wp_update_nav_menu_object( 0, $hdr_menu );

$ftr_menu = array(
    \'menu-name\'     => \'Footer Menu\'
    , \'description\' =>  \'The menu that appears at the bottom of most pages in this website\'
);
$footer_menu = wp_update_nav_menu_object( 0, $ftr_menu );

// Set the menus to appear in the proper theme locations
$locations = get_theme_mod(\'nav_menu_locations\');
$locations[\'header-menu\'] = $header_menu;
$locations[\'footer-menu\'] = $footer_menu;
set_theme_mod(\'nav_menu_locations\', $locations);

// Build menu item
$menu_item = array(
    \'menu-item-object-id\'       => $page_id
    , \'menu-item-parent-id\'     => 0
    , \'menu-item-position\'      => $menu_order
    , \'menu-item-object\'        => \'page\'
    , \'menu-item-type\'          => \'post_type\'
    , \'menu-item-status\'        => \'publish\'
    , \'menu-item-title\'         => $label
);

// Add to nav menu
wp_update_nav_menu_item( $header_menu, 0, $menu_item );

• get_theme_mod
• wp_update_nav_menu_item 这个博客有一个创建菜单项的好例子

function mysite_wpmu_new_blog($blog_id)
{
    switch_to_blog($blog_id);
    switch_theme(\'my-theme\', \'my-theme\');
    restore_current_blog();
}

add_action(\'wpmu_new_blog\', \'mysite_wpmu_new_blog\');

This works for me!