Php Wordpress子菜单问题。它没有'；不显示

我是Wordpress的新手。我正在尝试创建一个菜单或插件。 并且子菜单没有显示在任何地方。有人能帮忙吗

add_action('admin_menu', 'peewaMenu');

function peewaMenu()
{
        add_menu_page( 'Peewa Serials', 'Peewa Keys', 'manage_options', 'main-peewa', 'peewaMain' );

add_submenu_page('peewaAdd', 'Add new customer', 'Add new customer', 'manage_options', 'main-peewa');
}

function peewaMain(){
        include_once('peewa-admin.php');
}
function peewaAdd(){
        include_once('peewa-addnew.php');
}

根据该标准，应为：

add_menu_page ( string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '', string $icon_url = '', int $position = null )

add_submenu_page ( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )

add_menu_page( 'Peewa Serials', 'Peewa Keys', 'manage_options', 'main-peewa', 'peewaMain' );

add_submenu_page('main-peewa', 'Add new customer', 'Add new customer', 'manage_options', 'main-peewa/1', 'peewaAdd');

您的参数不匹配，因此应为：

add_menu_page ( string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '', string $icon_url = '', int $position = null )

add_submenu_page ( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )

add_menu_page( 'Peewa Serials', 'Peewa Keys', 'manage_options', 'main-peewa', 'peewaMain' );

add_submenu_page('main-peewa', 'Add new customer', 'Add new customer', 'manage_options', 'main-peewa/1', 'peewaAdd');

根据该标准，应为：

add_menu_page ( string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '', string $icon_url = '', int $position = null )

add_submenu_page ( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )

add_menu_page( 'Peewa Serials', 'Peewa Keys', 'manage_options', 'main-peewa', 'peewaMain' );

add_submenu_page('main-peewa', 'Add new customer', 'Add new customer', 'manage_options', 'main-peewa/1', 'peewaAdd');

您的参数不匹配，因此应为：

add_menu_page ( string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '', string $icon_url = '', int $position = null )

add_submenu_page ( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )

add_menu_page( 'Peewa Serials', 'Peewa Keys', 'manage_options', 'main-peewa', 'peewaMain' );

add_submenu_page('main-peewa', 'Add new customer', 'Add new customer', 'manage_options', 'main-peewa/1', 'peewaAdd');