LuhnCalc和bpay MOD10版本5

Question

我使用以下PHP代码来计算BPay的CRN:

<?php
function LuhnCalc($number) {
  $chars = array_reverse(str_split($number, 1));
  $odd = array_intersect_key($chars, array_fill_keys(range(1, count($chars), 2), null));
  $even = array_intersect_key($chars, array_fill_keys(range(0, count($chars), 2), null));
  $even = array_map(function($n) { return ($n >= 5)?2 * $n - 9:2 * $n; }, $even);
  $total = array_sum($odd) + array_sum($even);
  return ((floor($total / 10) + 1) * 10 - $total) % 10;
}
print LuhnCalc($_GET['num']);
?>

然而,似乎BPAY是MOD 10的第5版,我找不到任何文档.它似乎与MOD10不一样.

测试的以下数字:

2005,1597,3651,0584,9675

bPAY
2005 = 20052
1597 = 15976
3651 = 36514
0584 = 05840
9675 = 96752

MY CODE 
2005 = 20057 
1597 = 15974 
3651 = 36517 
0584 = 05843 
9675 = 96752

如您所见,它们都不匹配BPAY数字.

Answer 1

该 PHP 函数将根据 mod10 版本 5 算法生成 BPay 参考号。

谁知道为什么 BPay 不能将其添加到他们的网站上。我只是通过谷歌搜索找到了一个解释，该算法被称为“MOD10V05”而不是“Mod 10 version 5”。

function generateBpayRef($number) {

    $number = preg_replace("/\D/", "", $number);

    // The seed number needs to be numeric
    if(!is_numeric($number)) return false;

    // Must be a positive number
    if($number <= 0) return false;

    // Get the length of the seed number
    $length = strlen($number);

    $total = 0;

    // For each character in seed number, sum the character multiplied by its one based array position (instead of normal PHP zero based numbering)
    for($i = 0; $i < $length; $i++) $total += $number{$i} * ($i + 1);

    // The check digit is the result of the sum total from above mod 10
    $checkdigit = fmod($total, 10);

    // Return the original seed plus the check digit
    return $number . $checkdigit;

}