Second-hand recycling website uses online transaction function developed by PHP

The second-hand recycling website uses the online transaction function developed by PHP

With the progress of society and changes in consumption concepts, the second-hand commodity trading market is gradually emerging. To meet this demand, many second-hand recycling websites have emerged. It not only provides users with a convenient second-hand transaction channel, but also realizes the reuse of resources and plays a certain role in environmental protection. These second-hand recycling websites are usually developed using PHP, and the online transaction function has become one of their core functions.

As a popular server-side scripting language, PHP is fast, flexible, and safe, and is very suitable for developing second-hand recycling websites. Through PHP, functions such as user registration, login, product publishing, product browsing, and transaction can be realized. The following will introduce the implementation of PHP code in detail for the online transaction function.

1. Database design

First of all, a database needs to be designed to store user information and product information. Taking the MySQL database as an example, two tables can be designed: user table and product table.

The user table structure is as follows:

CREATE TABLE users (
id INT(11) NOT NULL AUTO_INCREMENT,
username VARCHAR(255) NOT NULL,
password VARCHAR(255) NOT NULL,
email VARCHAR(255) NOT NULL,
contact_number VARCHAR(255) NOT NULL,
PRIMARY KEY (id)
);

The product table structure is as follows:

CREATE TABLE goods (
id INT(11) NOT NULL AUTO_INCREMENT,
name VARCHAR(255) NOT NULL,
description TEXT NOT NULL,
seller_id INT(11) NOT NULL,
price DECIMAL(10, 2) NOT NULL,
PRIMARY KEY ( id),
FOREIGN KEY (seller_id) REFERENCES users (id)
);

2. User registration and login

User registration and login are the prerequisites for users to conduct transactions on second-hand recycling websites. The following is a code example based on PHP and MySQL:

Registration code:

<?php
  $username = $_POST['username'];
  $password = $_POST['password'];
  $email = $_POST['email'];
  $contact_number = $_POST['contact_number'];

  // 在此添加对用户输入的验证

  $sql = "INSERT INTO users (username, password, email, contact_number) VALUES ('$username', '$password', '$email', '$contact_number')";
  $result = mysqli_query($conn, $sql);

  if ($result) {
    echo "注册成功";
  } else {
    echo "注册失败";
  }
?>

Login code:

<?php
  $username = $_POST['username'];
  $password = $_POST['password'];

  $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
  $result = mysqli_query($conn, $sql);

  if (mysqli_num_rows($result) > 0) {
    echo "登录成功";
  } else {
    echo "登录失败";
  }
?>

3. Posting and browsing products

After successfully registering and logging in, users can publish their second-hand products for others to browse. At the same time, users can also browse products posted by other users. The following is a code example:

Publish product code:

<?php
  $name = $_POST['name'];
  $description = $_POST['description'];
  $price = $_POST['price'];

  // 在此添加对用户输入的验证

  $seller_id = // 获取当前登录用户的id

  $sql = "INSERT INTO goods (name, description, seller_id, price) VALUES ('$name', '$description', '$seller_id', $price)";
  $result = mysqli_query($conn, $sql);

  if ($result) {
    echo "发布成功";
  } else {
    echo "发布失败";
  }
?>

Browse product code:

<?php
  $sql = "SELECT * FROM goods";
  $result = mysqli_query($conn, $sql);

  while ($row = mysqli_fetch_assoc($result)) {
    echo "商品名称：" . $row['name'];
    echo "商品描述：" . $row['description'];
    echo "商品价格：" . $row['price'];
    // ...
  }
?>

4. Transaction function

Users can choose Purchase items posted by other users. The following is an example of transaction code based on PHP and MySQL:

Purchase product code:

<?php
  $buyer_id = // 获取当前登录用户的id
  $goods_id = $_POST['goods_id'];

  $sql = "UPDATE goods SET buyer_id=$buyer_id WHERE id=$goods_id";
  $result = mysqli_query($conn, $sql);

  if ($result) {
    echo "购买成功";
  } else {
    echo "购买失败";
  }
?>

Through the above example code, the online transaction function developed by second-hand recycling website using PHP can be realized. Of course, for the sake of stability and security, only the basic code framework is provided here, and more verification and security measures are required in actual development.

To sum up, PHP, as a popular server-side scripting language, can well support the online transaction function of second-hand recycling websites. Through database design and corresponding PHP code implementation, users can easily register, log in, publish products, browse products and conduct transactions, providing a convenient platform for the second-hand product trading market.

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