Comments on: How to validate credit card number?

By: Mean visa

Mean visa — Mon, 07 Sep 2009 10:49:06 +0000

ne 1 got a valid master card 1..??

By: Emily

Emily — Fri, 04 Sep 2009 19:49:17 +0000

- MasterCard
* credit card number format is 51xxxx-55xxxx, with card number length is 16

52xxx is between 51xxx and 55xxx =)

By: adywicaksono

adywicaksono — Tue, 01 Sep 2009 08:41:45 +0000

not sure

By: ozgur uksal

ozgur uksal — Sun, 23 Aug 2009 08:46:03 +0000

hi. don’t think that the logic of your code is correct. It is because i have a master card that has 16 digits and starts with 5, but its second digit is 2. Therefore, it is determined as invalid according to your code, but my card number is real and valid.

By: Jose

Jose — Thu, 20 Aug 2009 20:04:54 +0000

The algorithm does not seem to work for american express or discover

is there anything special to check for these cards?

By: Alexei

Alexei — Sun, 03 May 2009 21:07:54 +0000

Really useful function
Thanks a lot

By: lovelyn

lovelyn — Sun, 15 Mar 2009 04:51:40 +0000

wat is the valid credit card number

By: Andre

Andre — Sat, 21 Feb 2009 13:34:56 +0000

This save me a lot of time!
Thanks from Holland

By: abi

abi — Mon, 11 Aug 2008 14:37:30 +0000

merci