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Title : After discovering some credit card validation routines didnt work - here is one that I found works with all the numbers I have tried so far
Categories : Credit Cards, Ecommerce, PHP Update Picture
John Craig
Date : Mar 02nd 1999
Grade : 4 of 5 (graded 2 times)
Viewed : 10595
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Search : More code by John Craig
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function CC_checksum($ccard){
if(strlen($ccard) < 1)
return 0;
$ccard = ereg_replace("[^[:digit:]]+", "", $ccard);
$checksum = 0;
$factor = (strlen($ccard) % 2) ? 1 : 2;
for($i = 0; $i < strlen($ccard); $i++){
$digit = substr($ccard, $i, 1);
$checksum += ($digit * $factor > 9) ? $digit * $factor - 9 : $digit * $factor;
$factor = ($factor == 1) ? 2 : 1;
}
return !($checksum % 10);
}



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