wordpress - 如果菜单别名与顶级菜单中的相同，则 add_submenu_page 不显示子菜单

Question

我正在尝试创建一个顶级菜单和一个子菜单，但为了防止在子菜单中复制顶级菜单，我将子菜单 menu_slug 设置为与顶级菜单相同。为什么在这种情况下根本不显示子菜单？

add_action("admin_menu", "setup_theme_admin_menus");    

function setup_theme_admin_menus() {    
    add_menu_page('Theme settings', 'Example theme', 'manage_options',   
        'tut_theme_settings', 'theme_settings_page');  

    add_submenu_page('tut_theme_settings',   
        'Front Page Elements', 'Front Page', 'manage_options',   
        'tut_theme_settings', 'theme_front_page_settings');   
}      

// Handler to top level menu
function theme_settings_page() {  
}  

function theme_front_page_settings() {
    echo "Some text of submenu page";  
}  

Answer 1

这是默认行为，请参阅 $menu_slug documentation对于 add_submenu_page:

If you want to NOT duplicate the parent menu item, you need to set the name of the $menu_slug exactly the same as the parent slug.

问题是放置相同的 slug 会合并菜单和子菜单的回调。

---

您可能需要操纵全局 $submenu 变量来实现您的目标，请注意我为子菜单提供了不同的 slug:

add_action( 'admin_menu', 'setup_theme_admin_menus' );    

function setup_theme_admin_menus() 
{    
    add_menu_page(
        'Theme settings', 
        'Example theme', 
        'manage_options',   
        'tut_theme_settings', 
        'theme_settings_page'
    );  

    add_submenu_page(
        'tut_theme_settings',       // parent slug
        'Front Page Elements 2',    // page title
        'Front Page 2',             // menu title
        'manage_options',           // capability
        'tut_theme_settings2',      // slug
        'theme_front_page_settings' // callback
    );  

    // REMOVE THE SUBMENU CREATED BY add_menu_page
    global $submenu;
    unset( $submenu['tut_theme_settings'][0] );
}