求多个父ID的情况下如何获取其下面的子ID的函数?
我在弄一个项目,需要多个父ID去查询其下面子ID的记录,写了个函数,只能查询单个父ID下面的,多个不知道怎么写了,没有思路,哪位帮下忙,在这谢过!奉上我自己写的函数:
function get_child_id($data, $parent_id = '0') { static $child; foreach ($data as $value) { if ($value['parent_id'] == $parent_id) { $child .= ',' . $value['cat_id']; $this->get_child_id($data, $value['cat_id'], $level + 1); } } return $child; }
回复讨论(解决方案)
循环调用你这个方法就可以了。
$parent_ids = array(1,2,3,4);$resul t= array();foreach($parent_ids as $parent_id){ $result[] = get_child_id($data, $parent_id);}function get_child_id($data, $parent_id = '0') { static $child; foreach ($data as $value) { if ($value['parent_id'] == $parent_id) { $child .= ',' . $value['cat_id']; $this->get_child_id($data, $value['cat_id'], $level + 1); } } return $child; }
对每个 父ID 都调用一下 get_child_id 不就行了?
不过 static $child; 会在多次调用时出问题的
多次循环 get_child_id会出现子栏目ID重复出现的情况
#2 我已经告诉你会出问题了
症结在 static $child; !
function get_child_id($data, $parent_id = '0') { $child = ''; foreach ($data as $value) { if ($value['parent_id'] == $parent_id) { $child .= ',' . $value['cat_id']; $child .= $this->get_child_id($data, $value['cat_id'], $level + 1); } } return $child; }
这个我发现了,但是还是会出现子栏目ID重复的情况
贴出你的测试数据,应该是 id 不唯一(没有死循环已经对你很客气了)
贴出你的测试数据,应该是 id 不唯一(没有死循环已经对你很客气了)
贴出你的测试数据,应该是 id 不唯一(没有死循环已经对你很客气了)
就是那个static问题,打开页面太多了,调试错了,不好意思啊版主!
我 #4 不是给你代码了吗?
我 #4 不是给你代码了吗?
看到了,也调试好了。谢谢版主

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a

Following its high-profile acquisition by Facebook in 2012, Instagram adopted two sets of APIs for third-party use. These are the Instagram Graph API and the Instagram Basic Display API.As a developer building an app that requires information from a

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio
