ABOUT -------------------------------------------------------------------- This class is written to be used as a credit card utility, allowing you to do validate the format of certain card types. Much of the information used to form the logic of this class was sourced from Michael Gilleland's Java class, which can be found at: http://www.merriampark.com/anatomycc.htm See his page(s) for his sources, and the RESOURCES section below for more on my resources. SOURCE -------------------------------------------------------------------- https://github.com/jonathanwkelly/PHP-Credit-Card-Validation-Script The github repo also contains a GUI test interface. TERMS -------------------------------------------------------------------- IIN: Issuer Identification Number MII: Major Industry Identifier Check Digit: The last digit of a card number, that is used in the Luhn Algorithm (see below) to determine if the number is a valid format. Luhn Algorithm: The algorithm used by most major card issuers to determine if a card format is valid. RESOURCES -------------------------------------------------------------------- IIN and MII: http://en.wikipedia.org/wiki/Bank_card_number Luhn Algorithm: http://en.wikipedia.org/wiki/Luhn_algorithm ISO/IEC 7812 Standards: http://en.wikipedia.org/wiki/ISO/IEC_7812 CUSTOMIZATION -------------------------------------------------------------------- To make this class work for your application, you should review and make appropriate adjustments to: var arrCardTypes var arrAcceptedMII RISK -------------------------------------------------------------------- This script has been thoroughly vetted with dozens of real VISA, AMEX and MC numbers (I didn't have accessibility to any DISCOVER cards), with legitimate responses. However, you too should test before implementing into your application. The source files are available at my github (see SOURCE section above). You should also review the IIN values at the RESOURCES listed above to ensure they are still accurate at the time of implementation. LIABILITY -------------------------------------------------------------------- You are solely responsible for any loss or security issues caused by any implementation of this script, either as a whole or any part(s).
bputt/PHP-Credit-Card-Validation-Script
Checks a card number for format, length and checkdigit (luhn algorithm)