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486 lines
9.0 KiB
PHP
486 lines
9.0 KiB
PHP
<?php
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/*==============================================================================
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This routine checks the credit card number. The following checks are made:
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1. A number has been provided
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2. The number is a right length for the card
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3. The number has an appropriate prefix for the card
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4. The number has a valid modulus 10 number check digit if required
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If the validation fails an error is reported.
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The structure of credit card formats was gleaned from a variety of sources on
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the web, although the best is probably on Wikepedia ("Credit card number"):
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http://en.wikipedia.org/wiki/Credit_card_number
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Input parameters:
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cardnumber number on the card
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cardname name of card as defined in the card list below
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Output parameters:
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cardnumber number on the card
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cardname name of card as defined in the card list below
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Author: John Gardner
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Date: 4th January 2005
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Updated: 26th February 2005 additional credit cards added
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1st July 2006 multiple definition of Discovery card removed
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27th Nov. 2006 Additional cards added from Wikipedia
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8th Dec 2007 Problem with Solo card definition corrected
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18th Jan 2008 Support for 18 digit Maestro cards added
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26th Nov 2008 Support for 19 digit Maestro cards added
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19th June 2009 Support for Laser debit cards
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if (isset($_GET['submitted'])) {
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if (checkCreditCard ($_GET['CardNumber'], $_GET['CardType'], $ccerror, $ccerrortext)) {
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$ccerrortext = 'This card has a valid format';
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}
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}
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==============================================================================*/
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function checkCreditCard ($cardnumber, $cardname, &$errornumber, &$errortext) {
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// Define the cards we support. You may add additional card types.
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// Name: As in the selection box of the form - must be same as user's
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// Length: List of possible valid lengths of the card number for the card
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// prefixes: List of possible prefixes for the card
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// checkdigit Boolean to say whether there is a check digit
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// Don't forget - all but the last array definition needs a comma separator!
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$cards = array ( array ('name' => 'American Express',
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'length' => '15',
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'prefixes' => '34,37',
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'checkdigit' => true
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),
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array ('name' => 'Diners Club Carte Blanche',
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'length' => '14',
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'prefixes' => '300,301,302,303,304,305',
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'checkdigit' => true
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),
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array ('name' => 'Diners Club',
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'length' => '14,16',
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'prefixes' => '305,36,38,54,55',
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'checkdigit' => true
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),
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array ('name' => 'Discover',
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'length' => '16',
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'prefixes' => '6011,622,64,65',
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'checkdigit' => true
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),
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array ('name' => 'Diners Club Enroute',
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'length' => '15',
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'prefixes' => '2014,2149',
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'checkdigit' => true
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),
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array ('name' => 'JCB',
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'length' => '16',
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'prefixes' => '35',
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'checkdigit' => true
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),
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array ('name' => 'Maestro',
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'length' => '12,13,14,15,16,18,19',
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'prefixes' => '5018,5020,5038,6304,6759,6761',
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'checkdigit' => true
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),
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array ('name' => 'MasterCard',
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'length' => '16',
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'prefixes' => '51,52,53,54,55',
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'checkdigit' => true
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),
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array ('name' => 'Solo',
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'length' => '16,18,19',
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'prefixes' => '6334,6767',
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'checkdigit' => true
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),
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array ('name' => 'Switch',
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'length' => '16,18,19',
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'prefixes' => '4903,4905,4911,4936,564182,633110,6333,6759',
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'checkdigit' => true
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),
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array ('name' => 'Visa',
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'length' => '13,16',
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'prefixes' => '4',
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'checkdigit' => true
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),
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array ('name' => 'Visa Electron',
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'length' => '16',
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'prefixes' => '417500,4917,4913,4508,4844',
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'checkdigit' => true
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),
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array ('name' => 'LaserCard',
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'length' => '16,17,18,19',
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'prefixes' => '6304,6706,6771,6709',
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'checkdigit' => true
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)
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);
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$ccErrorNo = 0;
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$ccErrors [0] = "Unknown card type";
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$ccErrors [1] = "No card number provided";
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$ccErrors [2] = "Credit card number has invalid format";
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$ccErrors [3] = "Credit card number is invalid";
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$ccErrors [4] = "Credit card number is wrong length";
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// Establish card type
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$cardType = -1;
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for ($i=0; $i<sizeof($cards); $i++) {
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// See if it is this card (ignoring the case of the string)
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if (strtolower($cardname) == strtolower($cards[$i]['name'])) {
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$cardType = $i;
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break;
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}
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}
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// If card type not found, report an error
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if ($cardType == -1) {
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$errornumber = 0;
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$errortext = $ccErrors [$errornumber];
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return false;
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}
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// Ensure that the user has provided a credit card number
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if (strlen($cardnumber) == 0) {
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$errornumber = 1;
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$errortext = $ccErrors [$errornumber];
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return false;
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}
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// Remove any spaces from the credit card number
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$cardNo = str_replace (' ', '', $cardnumber);
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// Check that the number is numeric and of the right sort of length.
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if (!preg_match('/^[0-9]{13,19}$/i',$cardNo)) {
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$errornumber = 2;
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$errortext = $ccErrors [$errornumber];
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return false;
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}
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// Now check the modulus 10 check digit - if required
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if ($cards[$cardType]['checkdigit']) {
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$checksum = 0; // running checksum total
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$mychar = ""; // next char to process
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$j = 1; // takes value of 1 or 2
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// Process each digit one by one starting at the right
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for ($i = strlen($cardNo) - 1; $i >= 0; $i--) {
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// Extract the next digit and multiply by 1 or 2 on alternative digits.
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$calc = $cardNo{$i} * $j;
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// If the result is in two digits add 1 to the checksum total
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if ($calc > 9) {
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$checksum = $checksum + 1;
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$calc = $calc - 10;
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}
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// Add the units element to the checksum total
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$checksum = $checksum + $calc;
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// Switch the value of j
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if ($j ==1) {$j = 2;} else {$j = 1;};
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}
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// All done - if checksum is divisible by 10, it is a valid modulus 10.
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// If not, report an error.
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if ($checksum % 10 != 0) {
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$errornumber = 3;
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$errortext = $ccErrors [$errornumber];
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return false;
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}
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}
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// The following are the card-specific checks we undertake.
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// Load an array with the valid prefixes for this card
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$prefix = explode(',',$cards[$cardType]['prefixes']);
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// Now see if any of them match what we have in the card number
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$PrefixValid = false;
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for ($i=0; $i<sizeof($prefix); $i++) {
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$exp = '^' . $prefix[$i];
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if (preg_match('/'.$exp.'/',$cardNo)) {
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$PrefixValid = true;
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break;
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}
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}
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// If it isn't a valid prefix there's no point at looking at the length
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if (!$PrefixValid) {
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$errornumber = 3;
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$errortext = $ccErrors [$errornumber];
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return false;
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}
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// See if the length is valid for this card
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$LengthValid = false;
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$lengths = explode(',',$cards[$cardType]['length']);
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for ($j=0; $j<sizeof($lengths); $j++) {
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if (strlen($cardNo) == $lengths[$j]) {
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$LengthValid = true;
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break;
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}
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}
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// See if all is OK by seeing if the length was valid.
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if (!$LengthValid) {
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$errornumber = 4;
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$errortext = $ccErrors [$errornumber];
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return false;
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};
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// The credit card is in the required format.
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return true;
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}
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/*============================================================================*/
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?>
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