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PHP写一个函数，打印出层次格式

知其黑、受其白发布时间：2021-04-25 18:55:21 ，浏览量：4

输出结果

在这里插入图片描述

题目分析

使用 pid 指向父级元素 id 是 “无限级分类” 的常用表示方法，观察题目的输出可知，这是一个深度遍历，从顶级节点开始遍历，如果某个节点下有子节点，则优先遍历子节点，直到顶级节点遍历完毕。

代码实现

在这里插入图片描述


    
        



        
        
            
                
                
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	[2] session_save_path(): open_basedir restriction in effect. File(/var/lib/php/session) is not within the allowed path(s): (/www/wwwroot/www.chaojiit.com/:/tmp/) /www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php 第 1239 行.
[8192] Array and string offset access syntax with curly braces is deprecated /www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 40 行.
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