帮我写一段有关购物网站的用户注册登录网站代码

好的，以下是一段购物网站的用户注册登录网站代码：注册页面： ```html <!DOCTYPE html> <html> <head> <title>用户注册</title> </head> <body> <h1>用户注册</h1> <form action="register.php" method="post"> <label for="username">用户名：</label> <input type="text" id="username" name="username" required><br> <label for="password">密码：</label> <input type="password" id="password" name="password" required><br> <label for="confirm_password">确认密码：</label> <input type="password" id="confirm_password" name="confirm_password" required><br> <label for="email">邮箱：</label> <input type="email" id="email" name="email" required><br> <input type="submit" value="注册"> </form> </body> </html> ``` 登录页面： ```html <!DOCTYPE html> <html> <head> <title>用户登录</title> </head> <body> <h1>用户登录</h1> <form action="login.php" method="post"> <label for="username">用户名：</label> <input type="text" id="username" name="username" required><br> <label for="password">密码：</label> <input type="password" id="password" name="password" required><br> <input type="submit" value="登录"> </form> </body> </html> ``` PHP 注册处理代码： ```php <?php // 连接数据库 $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; $conn = new mysqli($servername, $username, $password, $dbname); if ($conn->connect_error) { die("连接失败: " . $conn->connect_error); } // 获取表单数据 $username = $_POST["username"]; $password = $_POST["password"]; $confirm_password = $_POST["confirm_password"]; $email = $_POST["email"]; // 检查用户名是否已存在 $sql = "SELECT * FROM users WHERE username='$username'"; $result = $conn->query($sql); if ($result->num_rows > ) { echo "用户名已存在"; exit; } // 检查密码是否一致 if ($password != $confirm_password) { echo "两次输入的密码不一致"; exit; } // 插入用户数据 $sql = "INSERT INTO users (username, password, email) VALUES ('$username', '$password', '$email')"; if ($conn->query($sql) === TRUE) { echo "注册成功"; } else { echo "注册失败: " . $conn->error; } $conn->close(); ?> ``` PHP 登录处理代码： ```php <?php // 连接数据库 $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; $conn = new mysqli($servername, $username, $password, $dbname); if ($conn->connect_error) { die("连接失败: " . $conn->connect_error); } // 获取表单数据 $username = $_POST["username"]; $password = $_POST["password"]; // 检查用户名和密码是否匹配 $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'"; $result = $conn->query($sql); if ($result->num_rows > ) { echo "登录成功"; } else { echo "用户名或密码错误"; } $conn->close(); ?> ```