Code Examples -> Credit Card validation routine. Uses MOD 10 to check if credit card number is valid.

	Submit Your Code
	SEO Monitor
	UpTime Monitor
	PHP Code Contest
	My Favorite Examples
	My Favorite Articles
	Update Your Profile

More Weber Sites
	PHP Code Search
	Web Development Forums
	Learn MySQL Playing Trivia
	PHPBB2 Templates
	Web Development Index
	Web Development Resources
	Web Development Content

Recommended Links
	PHPClasses
	PHP Editor
	PHP Jobs
	Vision.To Design
	Ajax Tutorials
	PHP Programming Help
	PHP/MySQL Programming
	Webmaster Resources
	Webmaster Forum
	XML meta language
	website builder

Recommended
	Mobile Dev World


BACK		ADD A COMMENT		SEND TO A FRIEND		ADD TO MY FAVORITES		ADD CODE EXAMPLES		PRINT

PHP Code Examples

Title :	Credit Card validation routine. Uses MOD 10 to check if credit card number is valid.
Categories :	Ecommerce, Credit Cards, PHP, Complete Programs	Brett Error
Date :	May 16th 1998
Grade :	2 of 5 (graded 4 times)
Viewed :	20765
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Brett Error
Action :	Grade This Code Example
Tools :	My Examples List

Code

<?php

////////////////////////////////////////////////////
// //
// Credit card validation routine //
// May 15, 1998 //
// By Brett Error //
// brett@interwebdesign.com //
// //
// validateCC($number[,$type]) //
// Uses the MOD 10 algorythm to determine if a //
// credit card number is valid. //
// //
// $number = credit card account number //
// $type is optional. Setting type to //
// visa, mastercard, discover, or amex will //
// perform additional checking on the account //
// number. //
// //
// The function returns 1 (true) if the CC is //
// valid, 0 (false) if it is invalid, and -1 if //
// the type entered does not match the supported //
// types listed above. //
// //
////////////////////////////////////////////////////

function validateCC($ccnum, $type = 'unknown'){

        //Clean up input

        $type = strtolower($type);
        $ccnum = ereg_replace('[-[:space:]]', '',$ccnum);

        //Do type specific checks

        if ($type == 'unknown') {

                //Skip type specific checks

        }
        elseif ($type == 'mastercard'){
                if (strlen($ccnum) != 16 || !ereg('5[1-5]', $ccnum)) return 0;
        }
        elseif ($type == 'visa'){
                if ((strlen($ccnum) != 13 && strlen($ccnum) != 16) || substr
($ccnum, 0, 1) != '4') return 0;
        }
        elseif ($type == 'amex'){
                if (strlen($ccnum) != 15 || !ereg('3[47]', $ccnum)) return a;
        }
        elseif ($type == 'discover'){
                if (strlen($ccnum) != 16 || substr($ccnum, 0, 4) != '6011')
return 0;
        }
        else {
                //invalid type entered
                return -1;
        }

        // Start MOD 10 checks

        $dig = toCharArray($ccnum);
        $numdig = sizeof ($dig);
        $j = 0;
        for ($i=($numdig-2); $i>=0; $i-=2){
                $dbl[$j] = $dig[$i] * 2;
                $j++;
        }
        $dblsz = sizeof($dbl);
        $validate =0;
        for ($i=0;$i<$dblsz;$i++){
                $add = toCharArray($dbl[$i]);
                for ($j=0;$j<sizeof($add);$j++){
                        $validate += $add[$j];
                }
        $add = '';
        }
        for ($i=($numdig-1); $i>=0; $i-=2){
                $validate += $dig[$i];
        }
        if (substr($validate, -1, 1) == '0') return 1;
        else return 0;
}

// takes a string and returns an array of characters

function toCharArray($input){
        $len = strlen($input);
        for ($j=0;$j<$len;$j++){
                $char[$j] = substr($input, $j, 1);
        }
        return ($char);
}

?>

Related Code Examples

	This is a redirection program which is as good as the come.to v3 url redirection, complete with admin interface all clients stored in mysql Categories : PHP, MySQL, Ecommerce, HTML and PHP, Complete Programs
	a class for doing payments to a cybercash server Categories : Ecommerce, Complete Programs, PHP Classes, PHP
	an example of the cyberlib payment class Categories : PHP, PHP Classes, Ecommerce, Credit Cards
	PHPCatalog Categories : Ecommerce, PHP, Complete Programs
	credit card security code Categories : PHP, Credit Cards, PHP Classes, Credit Cards
	Shopping Basket On-Line Ordering System. Categories : Complete Programs, MySQL, PHP, Ecommerce, Databases
	After discovering some credit card validation routines didnt work - here is one that I found works with all the numbers I have tried so far Categories : Credit Cards, Ecommerce, PHP
	Credit Card Identification and Validation Class - The credit_card class provides methods for cleaning, validating and identifying the type of credit card numbers. Categories : PHP, PHP Classes, Credit Cards, Ecommerce, Algorithms
	simple shopping cart for php3 Categories : PHP, PHP Classes, Complete Programs, Ecommerce
	PHP-MySQL shopping cart Categories : PHP, Ecommerce, Complete Programs
	phpAds, a complete banner and ad management system with detailled tracking and stats. Categories : MySQL, Complete Programs, Ecommerce, PHP, Databases
	Validation function for LUHNMod10 and variant. Can discriminate credit card numbers of varying lengths. Uses [Double >> Sum-of-Digits] transform. Categories : Credit Cards, Authentication, Ecommerce, PHP
	ECHOcart - Open Source Shopping Cart Categories : PHP, Credit Cards, Ecommerce
	REALTIME SHIPPING QUOTE Categories : Complete Programs, Ecommerce, PHP
	A set of functions to check the validity of a credit card number. Categories : Ecommerce, Credit Cards, PHP