PHP implements subcategories and related article display techniques in WeChat mini programs

With the advent of the mobile Internet era, more and more companies are beginning to pay attention to the development of WeChat mini programs. WeChat Mini Program is a small application developed based on the WeChat ecosystem. It has the characteristics of no installation required, lightweight and easy to use. In order to meet the needs of users, WeChat mini programs usually need to support classification and the display of related articles. This article will introduce how to use PHP to implement subcategories in WeChat mini programs and related article display techniques, helping developers quickly build their own WeChat mini programs.

1. Display of subcategories

In WeChat mini programs, subcategories can help users better understand the hierarchical structure of topics and improve user experience. Subcategories can generally be divided into two types: nested types and flat types. The nested type is to nest subcategories under parent categories, with a clear hierarchy. In the flat type, all subcategories are at the same level, making it easier for users to find them quickly.

1. Use infinite-level classification to implement nested types

Infinite-level classification is a tree structure used to represent data with recursive attributes. Its advantage is that it can easily find the specified category and all its parent categories. The steps to implement unlimited classification using PHP are as follows:

(1) Query all categories

SELECT * FROM category;

(2) Get subcategories

function getChildren($data,$pid,&$result)
{

foreach($data as $item)
{
    if($item['pid']==$pid)
    {
        $result[]=$item;
        getChildren($data,$item['id'],$result);
    }
}

}

(3) Call the getChildren function

$result=array( );
getChildren($data,$pid,$result);

Among them, $data is the query result array, $pid is the parent category ID, and $result is the return result.

2. Use lists to display flat types

Subcategories of flat types are usually displayed using lists. In PHP, you can use a foreach loop to traverse the query results and generate corresponding indents based on the classification level.

(1) Query all categories

SELECT * FROM category;

(2) Loop traversal

foreach($data as $item)
{

$level=$item['level']+1;
$space=str_repeat('    ',$level);
echo $space.$item['name'];

}

Among them, $data is the query result array, $level is the classification level, and $space is the indentation.

2. Display of related articles

Related articles recommend related content based on the tag or classification of the current article to help users better explore and understand the content of the website. The key to realizing related article display is tag classification and data query.

1. Implementation of tag classification

In order to facilitate query, articles need to be stored in tags or categories. The storage of tag classification generally uses a many-to-many relationship, and the relationship between articles and tags is established through an intermediate table.

（1）Create tag table

CREATE TABLE tag(

id INT(11) NOT NULL AUTO_INCREMENT,
name VARCHAR(255) NOT NULL ,
PRIMARY KEY(id)

);

（2）Create article table

CREATE TABLE article(

id INT(11) NOT NULL AUTO_INCREMENT,
title VARCHAR(255) NOT NULL ,
content TEXT NOT NULL ,
PRIMARY KEY(id)

);

(3) Create an intermediate table

CREATE TABLE article_tag_rel(

id INT(11) NOT NULL AUTO_INCREMENT,
article_id INT(11) NOT NULL,
tag_id INT(11) NOT NULL,
PRIMARY KEY(id)

);

2. Query of related articles

The query of related articles is usually implemented using joint table query and LIKE statement. First, you need to get the tag or category of the current article, and then query related articles based on the tag or category.

(1) Get the tag or category of the current article

SELECT tag_id FROM article_tag_rel WHERE article_id=$article_id;

(2) Query related articles

SELECT * FROM article WHERE id<>$article_id AND title LIKE '%{$keyword}%';

Among them, $article_id is the current article ID, and $keyword is the label or classification keyword.

To sum up, the key to using PHP to implement subcategories and related article display techniques in WeChat mini programs lies in data query and page display. Developers can choose an implementation method that suits them according to their own needs. Through the introduction of this article, I believe it can help developers better understand the development and implementation techniques of WeChat mini programs.

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