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| Code | |||||
<?php /* +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant | | (See end of file for usage notes and licensing information.) | +----------------------------------------------------------------------+ */ class credit_card { function clean_no ($cc_no) { // Remove non-numeric characters from $cc_no return ereg_replace ('[^0-9]+', '', $cc_no); } function identify ($cc_no) { $cc_no = credit_card::clean_no ($cc_no); // Get card type based on prefix and length of card number if (ereg ('^4(.{12}|.{15})$', $cc_no)) return 'Visa'; if (ereg ('^5[1-5].{14}$', $cc_no)) return 'Mastercard'; if (ereg ('^3[47].{13}$', $cc_no)) return 'American Express'; if (ereg ('^3(0[0-5].{11}|[68].{12})$', $cc_no)) return 'Diners Club/Carte Blanche'; if (ereg ('^6011.{12}$', $cc_no)) return 'Discover Card'; if (ereg ('^(3.{15}|(2131|1800).{11})$', $cc_no)) return 'JCB'; if (ereg ('^2(014|149).{11})$', $cc_no)) return 'enRoute'; return 'unknown'; } function validate ($cc_no) { // Reverse and clean the number $cc_no = strrev (credit_card::clean_no ($cc_no)); // VALIDATION ALGORITHM // Loop through the number one digit at a time // Double the value of every second digit (starting from the right) // Concatenate the new values with the unaffected digits for ($ndx = 0; $ndx < strlen ($cc_no); ++$ndx) $digits .= ($ndx % 2) ? $cc_no[$ndx] * 2 : $cc_no[$ndx]; // Add all of the single digits together for ($ndx = 0; $ndx < strlen ($digits); ++$ndx) $sum += $digits[$ndx]; // Valid card numbers will be transformed into a multiple of 10 return ($sum % 10) ? FALSE : TRUE; } function check ($cc_no) { $valid = credit_card::validate ($cc_no); $type = credit_card::identify ($cc_no); return array ($valid, $type, 'valid' => $valid, 'type' => $type); } } /* +----------------------------------------------------------------------+ | FILE NAME: credit_card.pkg | +----------------------------------------------------------------------+ | Author: J.A.Greant | | Email : zak@nucleus.com | | Date : 2000/11/23 | +----------------------------------------------------------------------+ | The credit_card class provides methods for cleaning, validating and | | identifying the type of credit card number. The validation algorithm | | and identification procedures are based on information found at: | | http://www.beachnet.com/~hstiles/cardtype.html | | | | credit_card::clean_no() method | | ------------------------------ | | Strips all non-numeric characters from the passed value and returns | | an integer. This method is called by the other methods in the | | credit_card class. | | | | USAGE EXAMPLE: | | $cc_no ="5454 5454 5454 5454"; // Has spaces for readability | | $cleaned_cc_no = credit_card::clean_no ($cc_no); | | print $cleaned_cc_no; // Displays 5454545454545454 | | | | credit_card::identify() method | | ------------------------------ | | Finds the type of credit card (Mastercard, Visa, etc...) based on | | the length and format of the credit card number. The method can | | identify American Express, Diners Club/Carte Blanche, Discover, | | enRoute, JCB, Mastercard and Visa cards. | | | | USAGE EXAMPLE: | | $cc_no ="5454 5454 5454 5454"; | | print credit_card::identify ($cc_no); // Returns "Mastercard" | | | | credit_card::validate() method | | ------------------------------ | | Validate a credit card number using the LUHN formula (mod 10). | | Note that many other kinds of card and account numbers are based on | | the LUHN algorith - including Canadian Social Insurance Numbers. | | | | USAGE EXAMPLE: | | $cc_no ="5454 5454 5454 5454"; | | print credit_card::validate ($cc_no); // Returns TRUE | | | | credit_card::check() method | | --------------------------- | | The check() method validates and identifies a credit card, returning | | an array. Indexes 0 and 'valid' will contain TRUE if the card number | | is valid (FALSE if it isn't), while indexes 1 and 'type' will | | the type of card (if known). The presence of the numeric keys allows | | the method to be used with the list() function. | | | | USAGE EXAMPLE: | | $cc_no ="4111 1111 1111 1111"; | | list ($valid, $type) = credit_card::check ($cc_no); | | print $valid; // Displays 1 (TRUE) | | print $type; // Displays "Visa" | +----------------------------------------------------------------------+ +----------------------------------------------------------------------+ | CVS LOG INFO | +----------------------------------------------------------------------+ $Log: credit_card_validator.pkg,v $ Revision 1.2 2000/11/24 07:02:15 zak Added top copyright notice Revision 1.1 2000/11/24 06:58:42 zak Initial commit of credit card class to repository. Cleaned and modified code. Also rewrote significant parts of code so that I could change to the more friendly BSD-style license. +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant (zak@nucleus.com) | | All rights reserved. | +----------------------------------------------------------------------+ | Redistribution and use in source and binary forms, with or without | | modification, is permitted provided that the following conditions | | are met: | +----------------------------------------------------------------------+ | Redistributions of source code must retain the above copyright | | notice, this list of conditions and the following disclaimer. | | | | Redistributions in binary form must reproduce the above copyright | | notice, this list of conditions and the following disclaimer in the | | documentation and/or other materials provided with the distribution. | | | | Neither the name of the author nor the names of any contributors to | | this software may be used to endorse or promote products derived | | from this software without specific prior written permission. | | | | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | | AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | | POSSIBILITY OF SUCH DAMAGE. | +----------------------------------------------------------------------+ */ ?> | |||||
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