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Re: [PHP3] Credit Card
From: Stefan Powell (spowell <email protected>)
Date: 07/30/98
Stefan Powell wrote:
> <?php
> //Stefan's slightly obfuscated, but much improved LUHNMod10
> function LUHNMod10($ccnum) {
> if (!isset($ccnum)) return FALSE;
> $sum = 0;
> $len = strlen($ccnum);
> $ccnum=ereg_replace('[^[:digit:]]+','',$ccnum);
> for($idx=0;$idx<$len;$idx++) {
>...
Whoa! HUGE error in that function... I should set the length after
stipping the non-digits.
//Stefan's slightly obfuscated, but much MUCH improved LUHNMod10
function LUHNMod10($ccnum) {
if (!isset($ccnum)) return FALSE;
$ccnum=ereg_replace('[^[:digit:]]+','',$ccnum);
$sum = 0;
$len = strlen($ccnum);
for($idx=0;$idx<$len;$idx++) {
$digit = substr($ccnum,$idx,1);
if ($idx%2) {$sum += ($digit >= 5) ? 1+(($digit*2)%10) : $digit*2;}
else {$sum += $digit;}
}
if ($sum%10) return FALSE;
return TRUE;
}
--Stef
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