Validating credit card Real sexy cam
Without a valid owner name, an expiration date and a valid CVV code, they can't be used for real transactions.Note that the algorithm used here is freely available across the web even Assume that you are using two separated fields for expiration date.The first field asks user to fill the expiration month, and the second one is for the expiration year.The only problem with this is there is a cost for each transaction. I'm shocked that people are upvoting this garbage for 7 years .It may be small but it adds up and if someone is running a large number of fraudulent card numbers through your system the fees can become overwhelming. For example /^([34|37])([0-9])$/";//American Express will evaluate to true on a bad card number sach as 770000000000002. Diner's and Mastercard regex are also wrong along the same lines The luhn algorithm is a checksum that can used to validate the format of a lot of credit card formats (and also Canadian social insurance numbers...) The wikipedia article also links to many different implementations; here's a PHP one:
Return true if the value is a valid credit card number. Part of the file Note: The algorithm used can't verify the validity of the number – it is just an integrity check.Because the date validator asks for all the year, month and day, it isn't helpful in that case.This example introduces some approaches to solve this problem.As with any other clientside validation, you have to implement the same or better validation on the serverside.The question is that how to validate the expiration date which is often a required part in a payment form.