20) {
$error = '用户名长度3-20个字符';
} elseif (strlen($password) < 6) {
$error = '密码长度至少6位';
} elseif ($password !== $confirm) {
$error = '两次密码输入不一致';
} else {
// 检查用户名是否已存在
$stmt = $pdo->prepare('SELECT id FROM users WHERE username = ?');
$stmt->execute([$username]);
if ($stmt->fetch()) {
$error = '用户名已存在';
} else {
$pdo->beginTransaction();
try {
// 验证邀请码（次数校验：未超限 或 不限次数）
$stmt = $pdo->prepare("SELECT id, max_uses, used_count FROM invite_codes WHERE code = ? AND (used_count < max_uses OR max_uses = 0) FOR UPDATE");
$stmt->execute([$invite]);
$ic = $stmt->fetch();
if (!$ic) {
$error = '邀请码无效或已超出使用次数';
$pdo->rollBack();
} else {
$hash = password_hash($password, PASSWORD_DEFAULT);
$stmt = $pdo->prepare('INSERT INTO users (username, password) VALUES (?, ?)');
$stmt->execute([$username, $hash]);
// 增加邀请码使用次数
$stmt = $pdo->prepare('UPDATE invite_codes SET used_count = used_count + 1 WHERE id = ?');
$stmt->execute([$ic['id']]);
$pdo->commit();
redirect('login.php');
}
} catch (Exception $e) {
$pdo->rollBack();
$error = '注册失败，请重试';
}
}
}
}
?>
注册 - 兑换码管理系统