mirror of
https://github.com/OpenXE-org/OpenXE.git
synced 2024-12-25 06:00:28 +01:00
486 lines
9.0 KiB
PHP
486 lines
9.0 KiB
PHP
<?php
|
|
|
|
/*==============================================================================
|
|
|
|
|
|
|
|
This routine checks the credit card number. The following checks are made:
|
|
|
|
|
|
|
|
1. A number has been provided
|
|
|
|
2. The number is a right length for the card
|
|
|
|
3. The number has an appropriate prefix for the card
|
|
|
|
4. The number has a valid modulus 10 number check digit if required
|
|
|
|
|
|
|
|
If the validation fails an error is reported.
|
|
|
|
|
|
|
|
The structure of credit card formats was gleaned from a variety of sources on
|
|
|
|
the web, although the best is probably on Wikepedia ("Credit card number"):
|
|
|
|
|
|
|
|
http://en.wikipedia.org/wiki/Credit_card_number
|
|
|
|
|
|
|
|
Input parameters:
|
|
|
|
cardnumber number on the card
|
|
|
|
cardname name of card as defined in the card list below
|
|
|
|
Output parameters:
|
|
|
|
cardnumber number on the card
|
|
|
|
cardname name of card as defined in the card list below
|
|
|
|
|
|
|
|
Author: John Gardner
|
|
|
|
Date: 4th January 2005
|
|
|
|
Updated: 26th February 2005 additional credit cards added
|
|
|
|
1st July 2006 multiple definition of Discovery card removed
|
|
|
|
27th Nov. 2006 Additional cards added from Wikipedia
|
|
|
|
8th Dec 2007 Problem with Solo card definition corrected
|
|
|
|
18th Jan 2008 Support for 18 digit Maestro cards added
|
|
|
|
26th Nov 2008 Support for 19 digit Maestro cards added
|
|
|
|
19th June 2009 Support for Laser debit cards
|
|
|
|
|
|
|
|
|
|
|
|
if (isset($_GET['submitted'])) {
|
|
|
|
if (checkCreditCard ($_GET['CardNumber'], $_GET['CardType'], $ccerror, $ccerrortext)) {
|
|
|
|
$ccerrortext = 'This card has a valid format';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
==============================================================================*/
|
|
|
|
|
|
|
|
|
|
|
|
function checkCreditCard ($cardnumber, $cardname, &$errornumber, &$errortext) {
|
|
|
|
|
|
|
|
// Define the cards we support. You may add additional card types.
|
|
|
|
|
|
|
|
// Name: As in the selection box of the form - must be same as user's
|
|
|
|
// Length: List of possible valid lengths of the card number for the card
|
|
|
|
// prefixes: List of possible prefixes for the card
|
|
|
|
// checkdigit Boolean to say whether there is a check digit
|
|
|
|
|
|
|
|
// Don't forget - all but the last array definition needs a comma separator!
|
|
|
|
|
|
|
|
$cards = array ( array ('name' => 'American Express',
|
|
|
|
'length' => '15',
|
|
|
|
'prefixes' => '34,37',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Diners Club Carte Blanche',
|
|
|
|
'length' => '14',
|
|
|
|
'prefixes' => '300,301,302,303,304,305',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Diners Club',
|
|
|
|
'length' => '14,16',
|
|
|
|
'prefixes' => '305,36,38,54,55',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Discover',
|
|
|
|
'length' => '16',
|
|
|
|
'prefixes' => '6011,622,64,65',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Diners Club Enroute',
|
|
|
|
'length' => '15',
|
|
|
|
'prefixes' => '2014,2149',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'JCB',
|
|
|
|
'length' => '16',
|
|
|
|
'prefixes' => '35',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Maestro',
|
|
|
|
'length' => '12,13,14,15,16,18,19',
|
|
|
|
'prefixes' => '5018,5020,5038,6304,6759,6761',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'MasterCard',
|
|
|
|
'length' => '16',
|
|
|
|
'prefixes' => '51,52,53,54,55',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Solo',
|
|
|
|
'length' => '16,18,19',
|
|
|
|
'prefixes' => '6334,6767',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Switch',
|
|
|
|
'length' => '16,18,19',
|
|
|
|
'prefixes' => '4903,4905,4911,4936,564182,633110,6333,6759',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Visa',
|
|
|
|
'length' => '13,16',
|
|
|
|
'prefixes' => '4',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'Visa Electron',
|
|
|
|
'length' => '16',
|
|
|
|
'prefixes' => '417500,4917,4913,4508,4844',
|
|
|
|
'checkdigit' => true
|
|
|
|
),
|
|
|
|
array ('name' => 'LaserCard',
|
|
|
|
'length' => '16,17,18,19',
|
|
|
|
'prefixes' => '6304,6706,6771,6709',
|
|
|
|
'checkdigit' => true
|
|
|
|
)
|
|
|
|
);
|
|
|
|
|
|
|
|
$ccErrorNo = 0;
|
|
|
|
|
|
|
|
$ccErrors [0] = "Unknown card type";
|
|
|
|
$ccErrors [1] = "No card number provided";
|
|
|
|
$ccErrors [2] = "Credit card number has invalid format";
|
|
|
|
$ccErrors [3] = "Credit card number is invalid";
|
|
|
|
$ccErrors [4] = "Credit card number is wrong length";
|
|
|
|
|
|
|
|
// Establish card type
|
|
|
|
$cardType = -1;
|
|
|
|
for ($i=0; $i<sizeof($cards); $i++) {
|
|
|
|
|
|
|
|
// See if it is this card (ignoring the case of the string)
|
|
|
|
if (strtolower($cardname) == strtolower($cards[$i]['name'])) {
|
|
|
|
$cardType = $i;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// If card type not found, report an error
|
|
|
|
if ($cardType == -1) {
|
|
|
|
$errornumber = 0;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Ensure that the user has provided a credit card number
|
|
|
|
if (strlen($cardnumber) == 0) {
|
|
|
|
$errornumber = 1;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Remove any spaces from the credit card number
|
|
|
|
$cardNo = str_replace (' ', '', $cardnumber);
|
|
|
|
|
|
|
|
// Check that the number is numeric and of the right sort of length.
|
|
|
|
if (!preg_match('/^[0-9]{13,19}$/i',$cardNo)) {
|
|
|
|
$errornumber = 2;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Now check the modulus 10 check digit - if required
|
|
|
|
if ($cards[$cardType]['checkdigit']) {
|
|
|
|
$checksum = 0; // running checksum total
|
|
|
|
$mychar = ""; // next char to process
|
|
|
|
$j = 1; // takes value of 1 or 2
|
|
|
|
|
|
|
|
// Process each digit one by one starting at the right
|
|
|
|
for ($i = strlen($cardNo) - 1; $i >= 0; $i--) {
|
|
|
|
|
|
|
|
// Extract the next digit and multiply by 1 or 2 on alternative digits.
|
|
|
|
$calc = $cardNo{$i} * $j;
|
|
|
|
|
|
|
|
// If the result is in two digits add 1 to the checksum total
|
|
|
|
if ($calc > 9) {
|
|
|
|
$checksum = $checksum + 1;
|
|
|
|
$calc = $calc - 10;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Add the units element to the checksum total
|
|
|
|
$checksum = $checksum + $calc;
|
|
|
|
|
|
|
|
// Switch the value of j
|
|
|
|
if ($j ==1) {$j = 2;} else {$j = 1;};
|
|
|
|
}
|
|
|
|
|
|
|
|
// All done - if checksum is divisible by 10, it is a valid modulus 10.
|
|
|
|
// If not, report an error.
|
|
|
|
if ($checksum % 10 != 0) {
|
|
|
|
$errornumber = 3;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// The following are the card-specific checks we undertake.
|
|
|
|
|
|
|
|
// Load an array with the valid prefixes for this card
|
|
|
|
$prefix = explode(',',$cards[$cardType]['prefixes']);
|
|
|
|
|
|
|
|
// Now see if any of them match what we have in the card number
|
|
|
|
$PrefixValid = false;
|
|
|
|
for ($i=0; $i<sizeof($prefix); $i++) {
|
|
|
|
$exp = '^' . $prefix[$i];
|
|
|
|
if (preg_match('/'.$exp.'/',$cardNo)) {
|
|
|
|
$PrefixValid = true;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// If it isn't a valid prefix there's no point at looking at the length
|
|
|
|
if (!$PrefixValid) {
|
|
|
|
$errornumber = 3;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
// See if the length is valid for this card
|
|
|
|
$LengthValid = false;
|
|
|
|
$lengths = explode(',',$cards[$cardType]['length']);
|
|
|
|
for ($j=0; $j<sizeof($lengths); $j++) {
|
|
|
|
if (strlen($cardNo) == $lengths[$j]) {
|
|
|
|
$LengthValid = true;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// See if all is OK by seeing if the length was valid.
|
|
|
|
if (!$LengthValid) {
|
|
|
|
$errornumber = 4;
|
|
|
|
$errortext = $ccErrors [$errornumber];
|
|
|
|
return false;
|
|
|
|
};
|
|
|
|
|
|
|
|
// The credit card is in the required format.
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
/*============================================================================*/
|
|
|
|
?>
|