信用卡卡號檢查

[yehlu]

http://www.beachnet.com/~hstiles/cardtype.html

https://www.zend.com/codex.php?id=80&single=1

<?php

/************************************************************************
*
* CCVal - Credit Card Validation function.
*
* Copyright (c) 1999 Holotech Enterprises. All rights reserved.
* You may freely modify and use this function for your own purposes. You
* may freely distribute it, without modification and with this notice
* and entire header intact.
*
* This function accepts a credit card number and, optionally, a code for
* a credit card name. If a Name code is specified, the number is checked
* against card-specific criteria, then validated with the Luhn Mod 10
* formula. Otherwise it is only checked against the formula. Valid name
* codes are:
*
* mcd - Master Card
* vis - Visa
* amx - American Express
* dsc - Discover
* dnc - Diners Club
* jcb - JCB
*
* A description of the criteria used in this function can be found at
* http://www.beachnet.com/~hstiles/cardtype.html. If you have any
* questions or comments, please direct them to ccval@holotech.net
*
* Alan Little
* Holotech Enterprises
* http://www.holotech.net/
* September 1999
*
************************************************************************/

function CCVal($Num, $Name = 'n/a') {

// Innocent until proven guilty
$GoodCard = true;

// Get rid of any non-digits
$Num = ereg_replace("[^[:digit:]]", "", $Num);

// Perform card-specific checks, if applicable
switch ($Name) {

case "mcd" :
$GoodCard = ereg("^5[1-5].{14}$", $Num);
break;

case "vis" :
$GoodCard = ereg("^4.{15}$|^4.{12}$", $Num);
break;

case "amx" :
$GoodCard = ereg("^3[47].{13}$", $Num);
break;

case "dsc" :
$GoodCard = ereg("^6011.{12}$", $Num);
break;

case "dnc" :
$GoodCard = ereg("^30[0-5].{11}$|^3[68].{12}$", $Num);
break;

case "jcb" :
$GoodCard = ereg("^3.{15}$|^2131|1800.{11}$", $Num);
break;
}

// The Luhn formula works right to left, so reverse the number.
$Num = strrev($Num);

$Total = 0;

for ($x=0; $x<strlen($Num); $x++) {
$digit = substr($Num,$x,1);

// If it's an odd digit, double it
if ($x/2 != floor($x/2)) {
$digit *= 2;

// If the result is two digits, add them
if (strlen($digit) == 2)
$digit = substr($digit,0,1) + substr($digit,1,1);
}

// Add the current digit, doubled and added if applicable, to the Total
$Total += $digit;
}

// If it passed (or bypassed) the card-specific check and the Total is
// evenly divisible by 10, it's cool!
if ($GoodCard && $Total % 10 == 0) return true; else return false;
}

?>

https://www.zend.com/codex.php?id=31&single=1

<?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 (jag@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. |
+----------------------------------------------------------------------+
*/
?>