Home Backend Development PHP Tutorial 递归调用有关问题

递归调用有关问题

Jun 13, 2016 pm 01:40 PM
child pid reply

递归调用问题,在线等

PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->function show_child($pid,$layer=0)
{
    global $db,$reply_arr,$layers,$circle_reply,$fid;
    if($layer >= 5)//递归层数
    {
        return;
    }
    $layer++;
    
    foreach($reply_arr as $k => $v)
    {
        if($v['reply'] == $pid)
        {
            $v['message'] = discuzcode($v['message'], $replya['smileyoff'], $replya['bbcodeoff'], $replya[
'htmlon'] & 1, 1, $forum['allowbbcode'], ($forum['allowimgcode'] && $showimages ? 1 : 0), $forum['allowhtml'], ($forum['jammer'] && $replya['authorid'] != $discuz_uid ? 1 : 0), 0, $replya['authorid'], $forum['allowmediacode'], $replya['pid']);
    
            echo $v['message'].'|'.$v['pid'].'<br>';
            show_child($v['pid']);
        }
    }
    
}
Copy after login

有这样一个函数,递归调用的,同时里面又有循环,可是递归之后,应该是由于$v被重新赋值的原因吧,循环就不再进行了。麻烦问高手们怎么解决?

------解决方案--------------------
试试加一句 reset($reply_arr)在循环前,
另外你那个$layer又在参数里(但是调用没用到),又global了,好像有点不妥
------解决方案--------------------
你把 show_child($v['pid']); 拿到if外面试试

------解决方案--------------------
你的意思是在第五层停止继续进行递归是不是?
如果是的话可以这么实现。
如果是我理解错了,就当我没有来过这里。

PHP code

function show_child($pid,$layer=0)
{
    if($layer \n";
        show_child($pid, ++$layer);
    }
    else {
        return false;
    }
}
<br><font color="#e78608">------解决方案--------------------</font><br>不要有问题就想到问人家 你就是解决问题的最佳人选啊  <br>送你一套 最完整的 php 教程 的 ppt 那里面 你可以解决你  <br>遇到的所有问题  <br>相信自己 自己就是解决问题的主人http://http://www.itkanba.com/bbs/viewthread.php?tid=9508&extra=
<br><font color="#e78608">------解决方案--------------------</font><br>
Copy after login
PHP code

function show_child($pid,$layer=0) { 
   global $db,$reply_arr,$layers,$circle_reply,$fid; 
   if($layer >= 5)//递归层数  
   { return; } $layer++; 

   foreach($reply_arr as $k => $v) { 
       if($v['reply'] == $pid) {
          echo $v['message'].'|'.$v['pid'].'<br>'; 
          show_child($v['pid'], 7); // here, you want to stop this loop , and
                                    // add the second parameter that is more than 5.
       } 
   } 
} <div class="clear">
                 
              
              
        
            </div>
Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Nordhold: Fusion System, Explained
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1666
14
PHP Tutorial
1273
29
C# Tutorial
1253
24
Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Apr 17, 2025 am 12:06 AM

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values ​​to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP: A Key Language for Web Development PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

How does PHP type hinting work, including scalar types, return types, union types, and nullable types? How does PHP type hinting work, including scalar types, return types, union types, and nullable types? Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values ​​and handle functions that may return null values.

The Enduring Relevance of PHP: Is It Still Alive? The Enduring Relevance of PHP: Is It Still Alive? Apr 14, 2025 am 12:12 AM

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP vs. Other Languages: A Comparison PHP vs. Other Languages: A Comparison Apr 13, 2025 am 12:19 AM

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

See all articles