RE: isCreditCard() and Mastercards?

[Justin D. Scott]

> It did work for Mastercard when I wrote it, but that
> was during the CF5 beta, so maybe their format has
> changed? I must admit I haven't used it for years.

If anyone is interested, I wrote a validation function based on the LUHN
formula to validate card numbers.  This can be added to the existing entry
an cflib, or if someone wants to submit it as a separate entry they are free
to do so.  Here's the code (watch for wrapping)...

<cfscript>
function luhn(cc_num) {
// luhn() - Version 1.00
// Written by Justin D. Scott of Sceiron Interactive, Inc.
// Use: luhn(card_number);
// Returns boolean if card is valid or not.
// Verifies the format of a credit card number via LUHN Formula (Mod 10)
// Based on information available at
http://www.beachnet.com/~hstiles/cardtype.html
var rev = reverse(cc_num); // Reverse the number so we can start at the end.
var tot = 0;
var tval = 0;
var doub = 0;
for (i=1; i lte len(rev); i=i+1) { // Iterate through each number.
        // Pick out the one to work with.
        tval = mid(rev, i, 1);
        // If it's in an odd numbered position simply add to the total.
        if (i mod 2) tot = tot + tval;
        else {
                // Otherwise double the value and add each of the digits
                // of the product to the total.
                doub = tval * 2;
                // So if the digit is 9 (ex: 9*2=18) then add 1 and
                // then 8 to the total.
                for (j=1; j lte len(doub); j=j+1) tot = tot + mid(doub, j,
1);
        }
} // And return a boolean.
return not tot mod 10;
}
</cfscript>




-----------------------------------
Justin D. Scott
Vice President
Sceiron Interactive, Inc.
www.sceiron.com

[EMAIL PROTECTED]
941.378.5341 - office
941.320.2402 - mobile
877.678.6011 - facsimile


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