递归函数中的父类数组键

Question

我很难理解为什么这不起作用。我的意思是，我的参考文献错了吗？我还没看到其他一些错误吗？

如果子元素处于活动状态，我想要做的是将父元素设置为活动状态。为了做到这一点，我将对父元素的引用传递给递归函数调用。

但不知怎的，它在实际的菜单树中没有得到更新。仅在局部变量中。

我对其他解决方案持开放态度，但也非常想知道这里出了什么问题。

private static function buildMenuTree($menus, &$parentTreeItem) {
    $tree = array();

    // loop through every menu item
    foreach ($menus as $menu) {
        // check if a parent menu exists, if not $parentId will bet set to 0
        $parentId = !array_key_exists('menu', $parentTreeItem) ? null : $parentTreeItem['menu']->id;

        // initialize new menu entry
        $currentTreeItem = [];

        // check current menu entry belongs to what was provided to us
        if($menu->parent == $parentId) {

            //set menu
            $currentTreeItem['menu'] = $menu;

            // check if route matches, then set the isActive flag
            if(Request::is($menu->route)) {
                $currentTreeItem['isActive'] = true;

                //if there is a valid parent, also set the isActiveFlag on the parent
                // TODO: this is changed on the local vaiable but not in the menu tree
                if($parentId != null) {
                    $parentTreeItem['isActive'] = true;
                }
            } else {
                $currentTreeItem['isActive'] = false;
            }


            // build menu tree for current item
            $currentTreeItem['menus'] = self::buildMenuTree($menus, $currentTreeItem);
            // add current item to menu tree
            $tree[] = $currentTreeItem;
        }
    }
    return $tree;
}

最好的问候