A second-hand recycling website developed using PHP supports virtual commodity transactions

Using PHP to develop a second-hand recycling website to support virtual commodity transactions

With the increasing awareness of environmental protection and the increasing consumption of goods, the second-hand trading market has gradually emerged. In order to facilitate people to buy and sell second-hand goods, many second-hand recycling websites have been developed. Not only can it display product information, but it can also conduct buying and selling transactions. With the rise of virtual goods, current second-hand recycling websites also need to support virtual goods transactions accordingly. In this article, I will introduce how to use PHP to develop a second-hand recycling website that supports virtual goods trading.

1. Project preparation

Before starting, we need to prepare the following tools and resources:

1. Computer and operating system: use Windows, Mac or Linux system Can.
2. Web server: such as Apache or Nginx.
3. Database management system: such as MySQL or SQLite.
4. Development environment: such as a combination of PHP and MySQL (usually LAMP or WAMP) or a software package (such as XAMPP) to quickly set up a development environment.
5. Code editor: such as Visual Studio Code, Sublime Text or PHPStorm.
6. Basic HTML and CSS knowledge.
7. Basic PHP programming knowledge.

2. Establish a database

First, we need to create a database to store product and user information. We can use the MySQL database to create a database named "secondhand", and then create the following two tables in it:

1. "products" table: used to store product information, including product name, Description, price, etc.

CREATE TABLE `products` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`description` TEXT,
`price` DECIMAL(10, 2) NOT NULL,
`image` VARCHAR(100),
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. "users" table: used to store user information, including username and password.

CREATE TABLE `users` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`username` VARCHAR(50) NOT NULL,
`password` VARCHAR(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3. Set up the website structure and UI

Next, we need to set up the page structure and user interface of the website. In this example, we will create the following pages:

1. Home page (index.php): displays the main content of the website and the latest product information.
2. Product details page (product.php): Displays detailed information of a single product.
3. Login page (login.php): Users can enter their username and password to log in.
4. Registration page (register.php): Users can register new users here.
5. User Center Page (user.php): Login users can view and manage their product information here.

4. Write PHP code

1. Database connection (config.php): First, we need to create a config.php file in the project to store database connection information.

<?php

$host = 'localhost';
$db = 'secondhand';
$user = 'root';
$pass = '';

$conn = new PDO("mysql:host=$host;dbname=$db;charset=utf8", $user, $pass);

?>

2. Homepage (index.php): On the homepage, we need to get the latest product information from the database and display it to the user.

<?php

include 'config.php';

$stmt = $conn->prepare("SELECT * FROM products ORDER BY id DESC LIMIT 10");
$stmt->execute();
$products = $stmt->fetchAll();

foreach ($products as $product) {
    // 显示商品信息
}

?>

3. Product details page (product.php): This page is used to display detailed information of a single product.

<?php

include 'config.php';

$id = $_GET['id'];

$stmt = $conn->prepare("SELECT * FROM products WHERE id = :id");
$stmt->bindParam(':id', $id);
$stmt->execute();
$product = $stmt->fetch();

// 显示商品详细信息

?>

4. Login page (login.php): Users can enter their username and password to log in on this page.

<?php

include 'config.php';

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];

    $stmt = $conn->prepare("SELECT * FROM users WHERE username = :username");
    $stmt->bindParam(':username', $username);
    $stmt->execute();
    $user = $stmt->fetch();

    if ($user && password_verify($password, $user['password'])) {
        // 登录成功，将用户信息存储到Session中
        $_SESSION['user'] = $user;
        header('Location: user.php');
    } else {
        // 登录失败
        echo '用户名或密码错误';
    }
}

?>

5. Registration page (register.php): Users can register new users on this page.

<?php

include 'config.php';

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = password_hash($_POST['password'], PASSWORD_BCRYPT);

    $stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (:username, :password)");
    $stmt->bindParam(':username', $username);
    $stmt->bindParam(':password', $password);
    $stmt->execute();

    // 注册成功，将用户信息存储到Session中
    $_SESSION['user'] = [
        'id' => $conn->lastInsertId(),
        'username' => $username
    ];

    header('Location: user.php');
}

?>

6. User center page (user.php): Login users can view and manage their product information on this page.

<?php

include 'config.php';

if (!isset($_SESSION['user'])) {
    header('Location: login.php');
    exit;
}

$stmt = $conn->prepare("SELECT * FROM products WHERE user_id = :user_id");
$stmt->bindParam(':user_id', $_SESSION['user']['id']);
$stmt->execute();
$products = $stmt->fetchAll();

foreach ($products as $product) {
    // 显示商品信息
}

?>

The above is just a simple example. In actual development, more functional design and security optimization are required. I hope that through this example, you can understand how to use PHP to develop a second-hand recycling website that supports virtual goods trading. I wish you success!

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