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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 |
John Craig |
| Date : |
Mar 02nd 1999 |
| Grade : |
4 of 5 (graded 2 times) |
| Viewed : |
13440 |
| File : |
No file for this code example. |
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| Search : |
More code by John Craig |
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| Action : |
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| Tools : |
My Examples List |
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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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