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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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	    基本
        文件
        流程
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	请求信息 : 2025-08-19 01:07:15 HTTP/2.0 GET : /home/article/detail/id/438744.html
运行时间 : 0.0510s ( Load:0.0126s Init:0.0013s Exec:0.0236s Template:0.0136s )
吞吐率 : 19.61req/s
内存开销 : 1,924.61 kb
查询信息 : 18 queries 0 writes 
文件加载 : 36
缓存信息 : 5 gets 0 writes 
配置加载 : 132
会话信息 : SESSION_ID=80hqti6ld99j583ub4vdjmp4d3
    
    
        
    
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/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Storage.class.php ( 1.38 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.56 KB )
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/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/View.class.php ( 7.96 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.69 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.89 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.93 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Conf/convention.php ( 11.18 KB )
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/www/wwwroot/www.chaojiit.com/Application/Home/Conf/config.php ( 0.05 KB )
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/www/wwwroot/www.chaojiit.com/Application/Home/Controller/ArticleController.class.php ( 6.71 KB )
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/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 1.43 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.27 KB )
    
    
        
    
	[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000010s ]
[ app_init ] --END-- [ RunTime:0.000054s ]
[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000538s ]
[ app_begin ] --END-- [ RunTime:0.000578s ]
[ view_parse ] --START--
[ template_filter ] --START--
Run Behavior\ContentReplaceBehavior [ RunTime:0.000096s ]
[ template_filter ] --END-- [ RunTime:0.000150s ]
Run Behavior\ParseTemplateBehavior [ RunTime:0.010350s ]
[ view_parse ] --END-- [ RunTime:0.010562s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000550s ]
[ view_filter ] --END-- [ RunTime:0.000583s ]
[ app_end ] --START--
    
    
        
    
	[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 37 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 99 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 99 行.
[8] Undefined variable: pinglun_list /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 108 行.
    
    
        
    
	SHOW COLUMNS FROM `configuration` [ RunTime:0.0010s ]
SELECT `value` FROM `configuration` WHERE `name` = 'site_name' LIMIT 1   [ RunTime:0.0007s ]
SHOW COLUMNS FROM `menu` [ RunTime:0.0014s ]
SELECT * FROM `menu` WHERE `fid` = 0 AND `status` = 1  [ RunTime:0.0002s ]
SELECT * FROM `menu` WHERE `fid` = 1 AND `status` = 1  [ RunTime:0.0003s ]
SELECT * FROM `menu` WHERE `fid` = 2 AND `status` = 1  [ RunTime:0.0003s ]
SELECT * FROM `menu` WHERE `fid` = 3 AND `status` = 1  [ RunTime:0.0002s ]
SELECT * FROM `menu` WHERE `fid` = 4 AND `status` = 1  [ RunTime:0.0002s ]
SHOW COLUMNS FROM `article` [ RunTime:0.0008s ]
SELECT * FROM `article` WHERE `id` = 438744 LIMIT 1   [ RunTime:0.0007s ]
SHOW COLUMNS FROM `bloger` [ RunTime:0.0005s ]
SELECT * FROM `bloger` WHERE `id` = 807 LIMIT 1   [ RunTime:0.0002s ]
SELECT COUNT(*) AS tp_count FROM `article` WHERE `bloger_id` = 807 LIMIT 1   [ RunTime:0.0003s ]
SHOW COLUMNS FROM `article_content` [ RunTime:0.0004s ]
SELECT `content` FROM `article_content` WHERE `article_id` = 438744 LIMIT 1   [ RunTime:0.0003s ]
SHOW COLUMNS FROM `article_cate` [ RunTime:0.0006s ]
SELECT `name` FROM `article_cate` WHERE `id` = 111 LIMIT 1   [ RunTime:0.0001s ]
SELECT * FROM `article` WHERE `bloger_id` = 807 ORDER BY view_count desc LIMIT 0,10   [ RunTime:0.0005s ]
    
    
        
    
	    
    
    



0.0510s