The second-hand recycling website uses the backend management system developed in PHP to simplify the operation process.

The second-hand recycling website uses the back-end management system developed by PHP to simplify the operation process

With the progress of society and the development of technology, the second-hand recycling industry is becoming more and more important. In order to better manage and operate the website, many second-hand recycling websites will choose to use PHP to develop a backend management system to simplify the operation process and improve efficiency. This article will introduce how to use PHP to develop a back-end management system for a second-hand recycling website, and give some code examples for reference.

First of all, we need to design the database structure to store user information, product information, order information, etc. In this example, we assume that our website needs to manage user information and order information. The following is an example of the database structure:

-- 创建用户表
CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(255) NOT NULL,
    password VARCHAR(255) NOT NULL
);

-- 创建订单表
CREATE TABLE orders (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    product_name VARCHAR(255) NOT NULL,
    price DECIMAL(10, 2) NOT NULL,
    status ENUM('pending', 'shipped', 'delivered') NOT NULL,
    FOREIGN KEY (user_id) REFERENCES users(id)
);

Next, we can use PHP to write the code of the backend management system. First, we need to connect to the database and handle the user's login logic. The following is a sample code:

<?php
// 数据库配置
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "example";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("数据库连接失败：" . $conn->connect_error);
}

// 处理用户登录逻辑
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];

    $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
        // 登录成功
    } else {
        // 登录失败
    }
}
?>

Next, we need to write some pages to display the user list and order list. The following is a sample code:

<?php
// 获取用户列表
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - 用户名: " . $row["username"]. "<br>";
    }
} else {
    echo "没有用户";
}
?>

<?php
// 获取订单列表
$sql = "SELECT * FROM orders";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - 商品名: " . $row["product_name"]. " - 价格: " . $row["price"]. "<br>";
    }
} else {
    echo "没有订单";
}
?>

In addition to the user list and order list, we also need some other functions, such as adding new users, editing user information, etc. The following is some sample code:

<?php
// 添加新用户
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];

    $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
    if ($conn->query($sql) === TRUE) {
        echo "新用户添加成功";
    } else {
        echo "新用户添加失败：" . $conn->error;
    }
}
?>

<?php
// 编辑用户信息
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $user_id = $_POST["user_id"];
    $username = $_POST["username"];
    $password = $_POST["password"];

    $sql = "UPDATE users SET username='$username', password='$password' WHERE id='$user_id'";
    if ($conn->query($sql) === TRUE) {
        echo "用户信息更新成功";
    } else {
        echo "用户信息更新失败：" . $conn->error;
    }
}
?>

In summary, through the development of PHP, we can create a powerful backend management system to simplify the operation process of second-hand recycling websites and improve work efficiency. The above is a simple example, you can improve and extend it according to your actual needs. Hope this article helps you!

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