php 会员卡号

<?php
function generateUniqueCardNumber() {
    $prefix = 'MC'; // 会员卡号前缀
    $suffixLength = 6; // 后缀长度
    $characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; // 可用字符
    $maxAttempts = 100; // 最大尝试次数

    for ($i = 0; $i < $maxAttempts; $i++) {
        $suffix = '';
        for ($j = 0; $j < $suffixLength; $j++) {
            $suffix .= $characters[rand(0, strlen($characters) - 1)];
        }
        $cardNumber = $prefix . $suffix;

        // 检查会员卡号是否已存在
        if (!checkCardNumberExists($cardNumber)) {
            return $cardNumber;
        }
    }

    throw new Exception("无法生成唯一的会员卡号");
}

function checkCardNumberExists($cardNumber) {
    // 连接数据库并检查会员卡号是否存在
    // 示例代码省略
    return false; // 假设不存在
}
?>

<?php
function encryptCardNumber($cardNumber) {
    $key = 'your_encryption_key'; // 加密密钥
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
    $encrypted = openssl_encrypt($cardNumber, 'aes-256-cbc', $key, 0, $iv);
    return base64_encode($iv . $encrypted);
}

function decryptCardNumber($encryptedCardNumber) {
    $key = 'your_encryption_key'; // 加密密钥
    $data = base64_decode($encryptedCardNumber);
    $iv = substr($data, 0, 16);
    $encrypted = substr($data, 16);
    return openssl_decrypt($encrypted, 'aes-256-cbc', $key, 0, $iv);
}
?>