callback ซ้อน callback ทำอย่างไรครับ?

$app = new \Slim\App();
$app->group('/users/{id:[0-9]+}', function () {
    $this->map(['GET', 'DELETE', 'PATCH', 'PUT'], '', function ($request, $response, $args) {
        // Find, delete, patch or replace user identified by $args['id']
    })->setName('user');
    $this->get('/reset-password', function ($request, $response, $args) {
        // Route for /users/{id:[0-9]+}/reset-password
        // Reset the password for user identified by $args['id']
    })->setName('user-password-reset');
});

$routes = [
    '/', [
        [
            '' => ['get', '\Modules\Home\Controllers\IndexController:indexAction'],
            '/somewhere' => ['get', 'Not:exists'],
        ]
    ]
]

foreach ($routes as $path => $routeArgs) {
    if (isset($routeArgs[0]) && is_array($routeArgs[0])) {
        // if this is route groups.
        global $aaa;
        $aaa = $routeArgs[0];
        call_user_func([$App, 'group'], $path, function() {
            global $aaa;
            foreach ($aaa as $each_group_path => $each_group_args) {
                call_user_func([$this, $each_group_args[0]], $each_group_path, $each_group_args[1]);
            }// endforeach;
        });
    } else {
        // if this is NOT route groups.
                
    }
}// endforeach;
unset($path, $routeArgs);

$App->group('/', function() {
    $this->any('', '\Modules\Home\Controllers\IndexController:indexAction');// เจอ
    $this->get('/somewhere', 'Not:exists');// ไม่เจอเป็นปกติ.
});