php怎么实现用户注册？步骤分享

<form method="post" action="register.php">
    <label for="username">用户名</label>
    <input type="text" name="username" required>

    <label for="email">电子邮件</label>
    <input type="email" name="email" required>

    <label for="password">密码</label>
    <input type="password" name="password" required>

    <label for="confirm_password">确认密码</label>
    <input type="password" name="confirm_password" required>

    <input type="submit" value="注册">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取用户输入的数据
    $username = $_POST['username'];
    $email = $_POST['email'];
    $password = $_POST['password'];
    $confirm_password = $_POST['confirm_password'];

    // 验证用户名是否符合要求
    if (strlen($username) < 6) {
        echo "用户名长度必须大于 6 个字符";
        exit;
    }

    // 验证电子邮件地址是否有效和唯一
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        echo "电子邮件地址无效";
        exit;
    }

    // 判断用户名和电子邮件地址是否唯一

    // 验证密码和确认密码是否匹配
    if ($password != $confirm_password) {
        echo '两次输入的密码不一致，请重新输入';
        exit;
    }

    // 保存用户的数据
    $hashed_password = password_hash($password, PASSWORD_DEFAULT);
    // 对密码进行哈希加密后保存

    // 发送一封确认邮件进行验证

    // 跳转到登录页面
    header('Location: login.php');
}
?>

// 建立一个连接
$conn = mysqli_connect("localhost", "my_user", "my_password", "my_db");

// 创建一个 SQL INSERT 语句
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$hashed_password')";

// 执行 SQL 语句
mysqli_query($conn, $sql);

// 导入 PHPMailer 库
require_once "PHPMailer/PHPMailer.php";
require_once "PHPMailer/SMTP.php";
require_once "PHPMailer/Exception.php";

// 创建一个新的 PHPMailer 实例
$mail = new PHPMailer\PHPMailer\PHPMailer();

// 使用 SMTP 服务器发送邮件
$mail->isSMTP();

// 设置邮件服务器地址和端口
$mail->Host = "smtp.example.com";
$mail->SMTPAuth = true;
$mail->Username = "your-email@example.com";
$mail->Password = "your-email-password";
$mail->SMTPSecure = "tls";
$mail->Port = 587;

// 设置发件人和收件人
$mail->setFrom('your-email@example.com', 'Your Name');
$mail->addAddress($email, $username);

// 设置邮件主题和内容
$mail->Subject = '确认您的电子邮件地址';
$mail->Body = "click to confirm your email address: https://your-website.com/confirm.php?email=$email&code=$confirmation_code";

// 发送邮件
if (!$mail->send()) {
    echo '邮件发送失败';
    exit;
}

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

    // 验证用户名和密码是否匹配
    $conn = mysqli_connect("localhost", "my_user", "my_password", "my_db");
    $sql = "SELECT * FROM users WHERE username='$username'";
    $result = mysqli_query($conn, $sql);

    if (mysqli_num_rows($result) == 1) {
        $row = mysqli_fetch_assoc($result);
        if (password_verify($password, $row['password'])) {
            echo "登录成功";
            exit;
        }
    }

    echo "用户名或密码错误，请重试";
}
?>
<form method="post" action="login.php">
    <label for="username">用户名</label>
    <input type="text" name="username" required>

    <label for="password">密码</label>
    <input type="password" name="password" required>

    <input type="submit" value="登录">
</form>