php - 在对象数组中取消设置对象

Question

我在使用对象从数组中删除项目时遇到问题，相同的代码在其他应用程序中运行。循环后数组 $categories 应该是空的。如果用户将第二个参数传递为 TRUE，下面的代码会删除所有子类别然后删除父类别，如果父类别没有子类别则只删除它。

//the $id of the category to be removed 
// $remove_children is state if you accept removing children categories  
function remove_category($id = null, $remove_children = false) {
    if ($this->MD->is_category($id) && is_bool($remove_children)) {
        //get all children category
        $children = $this->get_children_categories($id);
        if (!$children) {
            return $this->MD->remove($id, $this->categories_table);
        } else {
            if ($remove_children && is_array($children)) {
                unset($children['parent_category']);
                foreach ($children as $child) {
                    $removed = $this->MD->remove($child->id, $this->categories_table);
                    if ($removed) {
                        //problem here
                        unset($child);
                    }
                }
                //the $children is not empty after remove all the items
                if (empty($children)) {
                    return $this->MD->remove($id, $this->categories_table);
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }
    } else {
        return false;
    }
}

Answer 1

为了删除/设置 null 数组元素，我们需要传递数组的特定索引 unset($children[$key]);-

foreach ($children as $key=>$child) {
                    $removed = $this->MD->remove($child->id, $this->categories_table);
                    if ($removed) {
                        //problem here
                        unset($children[$key]);
                    }
                }

希望对您有所帮助。