Second-hand recycling website developed by PHP implements user points reward mechanism

CREATE TABLE users (
    id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(50) NOT NULL,
    password VARCHAR(50) NOT NULL,
    email VARCHAR(50) NOT NULL,
    points INT DEFAULT 0
);

<?php
// 处理用户注册请求
if($_SERVER["REQUEST_METHOD"] === "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    $email = $_POST["email"];
    
    // 将用户信息插入数据库
    $sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("sss", $username, $password, $email);
    $stmt->execute();
    
    // 注册成功后跳转到登录页面
    header("Location: login.php");
    exit;
}
?>

<form action="" method="post">
    <input type="text" name="username" placeholder="用户名">
    <input type="password" name="password" placeholder="密码">
    <input type="email" name="email" placeholder="邮箱">
    <button type="submit">注册</button>
</form>

<?php
session_start();
// 处理用户登录请求
if($_SERVER["REQUEST_METHOD"] === "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    
    // 查询数据库验证用户信息是否匹配
    $sql = "SELECT * FROM users WHERE username=? AND password=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("ss", $username, $password);
    $stmt->execute();
    
    // 如果查询结果存在记录，说明用户名和密码匹配
    if($stmt->fetch()) {
        // 将用户名存储到会话中
        $_SESSION["username"] = $username;
        
        // 跳转到用户个人中心页面
        header("Location: user.php");
        exit;
    } else {
        echo "用户名或密码错误";
    }
}
?>

<form action="" method="post">
    <input type="text" name="username" placeholder="用户名">
    <input type="password" name="password" placeholder="密码">
    <button type="submit">登录</button>
</form>

<?php
session_start();
// 处理用户发布二手物品请求
if($_SERVER["REQUEST_METHOD"] === "POST") {
    $item_name = $_POST["item_name"];
    $price = $_POST["price"];
    
    // 查询当前用户的积分情况
    $sql = "SELECT points FROM users WHERE username=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("s", $_SESSION["username"]);
    $stmt->execute();
    $stmt->bind_result($points);
    $stmt->fetch();
    
    // 根据价格给用户奖励相应的积分
    $bonus = 0;
    if($price >= 100) {
        $bonus = 10;
    }
    
    $total_points = $points + $bonus;
    
    // 更新用户的积分情况
    $sql = "UPDATE users SET points=? WHERE username=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("is", $total_points, $_SESSION["username"]);
    $stmt->execute();
    
    echo "发布成功！奖励积分：".$bonus;
}
?>

<form action="" method="post">
    <input type="text" name="item_name" placeholder="物品名称">
    <input type="number" name="price" placeholder="价格">
    <button type="submit">发布</button>
</form>

<?php
session_start();
// 处理用户完成交易请求
if($_SERVER["REQUEST_METHOD"] === "POST") {
    $item_id = $_POST["item_id"];
    $price = $_POST["price"];
    
    // 查询当前用户的积分情况
    $sql = "SELECT points FROM users WHERE username=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("s", $_SESSION["username"]);
    $stmt->execute();
    $stmt->bind_result($points);
    $stmt->fetch();
    
    // 根据交易金额给用户奖励相应的积分
    $bonus = floor($price/10);
    
    $total_points = $points + $bonus;
    
    // 更新用户的积分情况
    $sql = "UPDATE users SET points=? WHERE username=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("is", $total_points, $_SESSION["username"]);
    $stmt->execute();
    
    echo "交易完成！奖励积分：".$bonus;
}
?>

<form action="" method="post">
    <input type="text" name="item_id" placeholder="物品ID">
    <input type="number" name="price" placeholder="交易金额">
    <button type="submit">完成交易</button>
</form>