注册phpcms会员

<form action="index.php?m=member&c=index&a=register" method="post">
    <label for="username">用户名：</label>
    <input type="text" id="username" name="username" required><br><br>
    <label for="password">密码：</label>
    <input type="password" id="password" name="password" required><br><br>
    <label for="email">邮箱：</label>
    <input type="email" id="email" name="email" required><br><br>
    <input type="submit" value="注册">
</form>

<?php
// 检查表单提交
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];

    // 验证数据
    if (empty($username) || empty($password) || empty($email)) {
        echo '所有字段都是必填的';
        exit;
    }

    // 密码加密
    $hashed_password = password_hash($password, PASSWORD_DEFAULT);

    // 存储数据到数据库
    $db = new PDO('mysql:host=localhost;dbname=phpcms', 'username', 'password');
    $stmt = $db->prepare("INSERT INTO `v9_member` (username, password, email) VALUES (?, ?, ?)");
    $stmt->execute([$username, $hashed_password, $email]);

    echo '注册成功';
}
?>

$stmt = $db->prepare("SELECT * FROM `v9_member` WHERE username = ?");
$stmt->execute([$username]);
$user = $stmt->fetch();

if ($user) {
    echo '用户名已存在';
    exit;
}

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo '邮箱格式不正确';
    exit;
}

// 登录验证
$stmt = $db->prepare("SELECT * FROM `v9_member` WHERE username = ?");
$stmt->execute([$username]);
$user = $stmt->fetch();

if ($user && password_verify($password, $user['password'])) {
    echo '登录成功';
} else {
    echo '用户名或密码错误';
}