php 提现功能开发

// 示例代码：防止 SQL 注入
$stmt = $pdo->prepare('SELECT * FROM users WHERE id = :id');
$stmt->execute(['id' => $userId]);
$user = $stmt->fetch();

// 示例代码：使用 Redis 缓存
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$cacheKey = 'user_balance_' . $userId;
$balance = $redis->get($cacheKey);
if (!$balance) {
    $balance = getUserBalanceFromDB($userId);
    $redis->setex($cacheKey, 3600, $balance);
}

// 示例代码：使用事务记录交易
try {
    $pdo->beginTransaction();
    // 扣除用户余额
    $pdo->exec("UPDATE users SET balance = balance - $amount WHERE id = $userId");
    // 记录交易
    $pdo->exec("INSERT INTO transactions (user_id, amount, status) VALUES ($userId, $amount, 'completed')");
    $pdo->commit();
} catch (Exception $e) {
    $pdo->rollBack();
    throw $e;
}