How to use PHP to develop the second-hand transaction function of WeChat applet?

How to use PHP to develop the second-hand transaction function of WeChat applet?

As a popular mobile application development platform, WeChat applet is used by more and more developers. In WeChat mini programs, second-hand transactions are a common functional requirement. This article will introduce how to use PHP to develop the second-hand transaction function of the WeChat applet and provide specific code examples.

1. Preparation work
Before starting development, you need to ensure that the following conditions are met:

1. The development environment for the WeChat applet has been set up, including the registration of the applet AppID, and perform corresponding development configuration in the mini program background.
2. The PHP development environment has been set up, including the installation of PHP and corresponding development tools (such as Apache, MySQL, etc.).

2. Database design
Before developing the second-hand transaction function, you need to design the database table structure first. The following is a simple database table structure design example:

User table (users)

• User ID (user_id)
• User name (username)
• Password (password)
• Mobile phone number (phone_number)

Product list (goods)

• Product ID (goods_id)
• Product name (goods_name)
• Product description (goods_description)
• Product price (goods_price)
• Product image (goods_image)
• Seller ID (seller_id )
• Creation time (created_at)
• Update time (updated_at)

3. Back-end development

1. Create a PHP file , named "login.php". Write user login code in this file, verify whether the user name and password match, and return user information and login status.

// login.php

<?php
// 校验用户名和密码是否匹配
function checkUser($username, $password) {
    // 在数据库中查询用户信息
    // ...

    // 判断用户名和密码是否匹配
    if ($password == $result['password']) {
        return [
            'status' => true,
            'message' => '登录成功',
            'data' => [
                'user_id' => $result['user_id'],
                'username' => $result['username'],
            ]
        ];
    } else {
        return [
            'status' => false,
            'message' => '用户名或密码错误',
            'data' => null
        ];
    }
}

// 获取登录请求中的用户名和密码
$username = $_POST['username'];
$password = $_POST['password'];

// 校验用户名和密码是否匹配
$result = checkUser($username, $password);

// 返回登录结果
echo json_encode($result);
?>

2. Create a PHP file named "getGoods.php". Write the code to obtain the product list in this file, query the product information from the database, and return the product list.

// getGoods.php

<?php
// 获取商品列表
function getGoods() {
    // 查询数据库中的商品信息
    // ...

    // 返回商品列表
    return $result;
}

// 获取商品列表
$goodsList = getGoods();

// 返回商品列表
echo json_encode($goodsList);
?>

3. Create a PHP file named "addGoods.php". Write the code to publish the product in this file and insert the product information into the database.

// addGoods.php

<?php
// 发布商品
function addGoods($goodsInfo) {
    // 将商品信息插入到数据库中
    // ...
    
    // 返回发布结果
    return [
        'status' => true,
        'message' => '发布成功'
    ];
}

// 获取发布商品请求中的商品信息
$goodsInfo = $_POST['goodsInfo'];

// 发布商品
$result = addGoods($goodsInfo);

// 返回发布结果
echo json_encode($result);
?>

4. Front-end development

1. Create a login page in the mini program. After the user enters the user name and password, send a POST request to "login.php" to obtain the login result.

Sample code:

// login.js

// 获取登录页表单中的用户名和密码
var username = 'test';
var password = '123456';

// 发送登录请求
wx.request({
  url: 'http://your-domain.com/login.php',
  method: 'POST',
  data: {
    username: username,
    password: password
  },
  success: function(res) {
    console.log(res.data); // 打印登录结果
  }
})

2. Create a product list page, send a GET request to "getGoods.php" when the page loads, obtain the product list and render the page.

Sample code:

// goodsList.js

// 发送获取商品列表请求
wx.request({
  url: 'http://your-domain.com/getGoods.php',
  method: 'GET',
  success: function(res) {
    console.log(res.data); // 打印商品列表
    // 渲染页面
  }
})

3. Create a product publishing page. When the user clicks the publish button, send a POST request to "addGoods.php" and send the product information to terminal and processed.

Sample code:

// addGoods.js

// 获取发布页表单中的商品信息
var goodsInfo = {
  name: 'test',
  description: 'description',
  price: 100
};

// 发送发布商品请求
wx.request({
  url: 'http://your-domain.com/addGoods.php',
  method: 'POST',
  data: {
    goodsInfo: goodsInfo
  },
  success: function(res) {
    console.log(res.data); // 打印发布结果
  }
})

Through the above steps, we can use PHP to develop the second-hand transaction function of the WeChat applet. Of course, there may be many other requirements that need to be considered and implemented in actual development, but the above sample code can be used as a basis to develop the second-hand trading function. Hope this article is helpful to you!

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