PHP Credit Card Validation class using Mod 10 (Luhn) + more!

February 17, 2012 PHP, Programming

Here is another PHP code snippet from my library. This PHP class allows you to validate credit card information before processing it further. Doing all possible off-line checks before sending it to he credit card gateway will help you save time & money…

If the card is valid it will return cleaned & formatted card number along with the card type (Visa, Mastercard, Amex, Dinners, Discover, JCB & Maestro).

Besides regular checks, validates the card number against Mod 10 (Luhn) as well as know test card numbers…

Features

Checks if the card number, expiration date & validation numbers are valid.
Checks if the card is expired
Finds & returns the card type.
Checks against the known test card numbers.
Validates the card number using Mod 10 algorithm.

Usage Sample

<?php
require ('mod10.php');
$CARDTYPE = $ErrArr = NULL;

$cc = new CCVal($_POST["card_number"], $_POST["card_expire_month"], $_POST["card_expire_year"], $_POST["card_cvv2"]);

$cstatus = $cc->IsValid();

if ($cstatus[0] == "valid")
{
    $CARDTYPE = $cstatus[1];
    $_POST["card_number"] = $cstatus[2];
    $_POST["card_cvv2"] = $cstatus[3];
}
else
{
    $ErrArr = $cstatus;
}
?>

<?php

require ('mod10.php');

$CARDTYPE = $ErrArr = NULL;

$cc = new CCVal($_POST["card_number"], $_POST["card_expire_month"], $_POST["card_expire_year"], $_POST["card_cvv2"]);

$cstatus = $cc->IsValid();

if ($cstatus[0] == "valid")

{

$CARDTYPE = $cstatus[1];

$_POST["card_number"] = $cstatus[2];

$_POST["card_cvv2"] = $cstatus[3];

}

else

{

$ErrArr = $cstatus;

}

Download

Download PHP code snippet *UPDATED FOR AMEX CVV FIX
Code is PHP5 compatible but it should also work on PHP4 (Untested)

License

This code is free to use, distribute, modify and study. When referencing please link back to this website / post in any way e.g. direct link, credits etc. If you find this useful, please leave a comment and share using the buttons below!

<?php class CCVal
{
    var $__ccType = '';
    var $__ccNum = '';
    var $__ccExpM = 0;
    var $__ccExpY = 0;
    var $__ccCVV = '';
    function CCVal($num, $expm, $expy, $cvv)
    {
        if (!empty($num))
        {
            $cardNumber = ereg_replace("[^0-9]", "", $num);
            if (!empty($cardNumber))
            {
                $this - &gt;
                __ccNum = $cardNumber;
            }
        }

        if (!empty($cvv))
        {
            $cardCVV = ereg_replace("[^0-9]", "", $cvv);
            if (!empty($cardCVV))
            {
                $this - &gt;
                __ccCVV = $cardCVV;
            }
        }

        if (!is_numeric($expm) || $expm & lt;
        1 || $expm & gt;
        12)
        {
            $this - &gt;
            __ccExpM = NULL;
        }
        else
        {
            $this - &gt;
            __ccExpM = $expm;
        }

        $currentYear = date('Y');
        settype($currentYear, 'integer');
        $expy = $expy + 2000;
        if (!is_numeric($expy) || $expy & lt;
        $currentYear || $expy & gt;
        $currentYear + 15)
        {
            $this - &gt;
            __ccExpY = NULL;
        }
        else
        {
            $this - &gt;
            __ccExpY = $expy;
        }

        if (ereg("^5[1-5][0-9]{14}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = MASTERCARD;
        }
        elseif (ereg("^4[0-9]{12}([0-9]{3})?$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = VISA;
        }
        elseif (ereg("^3[47][0-9]{13}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = AMEX;
        }
        elseif (ereg("^3(0[0-5]|[68][0-9])[0-9]{11}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = DINNERS;
        }
        elseif (ereg("^6011[0-9]{12}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = DISCOVER;
        }
        elseif (ereg("^(3[0-9]{4}|2131|1800)[0-9]{11}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = JCB;
        }
        elseif (ereg("^(5[06-8]|6)[0-9]{10,17}$", $this - &gt;
        __ccNum))
        {
            $this - &gt;
            __ccType = MAESTRO;
        }
        else
        {
            $this - &gt;
            __ccType = UNKNOWN;
        }
    }

    function IsValid()
    {

        $validFormat = false;
        $validExp = false;
        $passCheck = false;
        $validCVV = false;
        $testCard = false;

        switch ($this - &gt;
        __ccType)
        {
            case MASTERCARD:
                $validFormat = true;
            break;
            case VISA:
                $validFormat = true;
            break;
            case AMEX:
                $validFormat = true;
            break;
            case DISCOVER:
                $validFormat = true;
            break;
            case DINNERS:
                $validFormat = true;
            break;
            case JCB:
                $validFormat = true;
            break;
            case MAESTRO:
                $validFormat = true;
            break;
            default:

                $validFormat = false;
        }

        $cardExpM = $this - &gt;
        __ccExpM;
        $cardExpY = $this - &gt;
        __ccExpY;

        if ($cardExpM & amp; & amp;
        $cardExpY & amp; & amp;
        date('Ym') & lt; = $cardExpY . $cardExpM)
        {
            $validExp = true;
        }
        $cardCVV = $this - &gt;
        __ccCVV;

        if ($cardCVV & amp; & amp;
        (strlen($cardCVV) == 3 & amp; & amp;
        $this - &gt;
        __ccType != AMEX))
        {
            $validCVV = true;
        }
        elseif ($cardCVV & amp; & amp;
        (strlen($cardCVV) == 4 & amp; & amp;
        $this - &gt;
        __ccType == AMEX))
        {
            $validCVV = true;
        }

        $cardNumber = strrev($this - &gt;
        __ccNum);
        $numSum = 0;

        for ($i = 0;$i & lt;strlen($cardNumber);$i++)
        {
            $currentNum = substr($cardNumber, $i, 1);
            if ($i % 2 == 1)
            {
                $currentNum *= 2;
            }
            if ($currentNum & gt;
            9)
            {
                $firstNum = $currentNum % 10;
                $secondNum = ($currentNum - $firstNum) / 10;
                $currentNum = $firstNum + $secondNum;
            }

            $numSum += $currentNum;
        }

        $passCheck = ($numSum % 10 == 0);

        $testCard = in_array($this - &gt;
        __ccNum, array(
            '340000000000009',
            '341111111111111',
            '343434343434343',
            '346827630435344',
            '370000000000002',
            '370000200000000',
            '370407269909809',
            '370556019309221',
            '371449635398431',
            '374200000000004',
            '376462280921451',
            '377752749896404',
            '378282246310005',
            '378734493671000',
            '30000000000004',
            '30569309025904',
            '5019717010103742',
            '30204169322643',
            '30218047196557',
            '30221511563252',
            '36000000000008',
            '36148900647913',
            '36700102000000',
            '38000000000006',
            '38520000023237',
            '6011000000000004',
            '6011000000000012',
            '6011000400000000',
            '6011000990139424',
            '6011111111111117',
            '6011153216371980',
            '6011601160116611',
            '6011687482564166',
            '6011814836905651',
            '201400000000009',
            '201481123699422',
            '214925980592653',
            '214983972181233',
            '180001638277392',
            '180040153546898',
            '180058601526635',
            '3528000700000000',
            '3528723740022896',
            '3530111333300000',
            '3566002020360505',
            '3569990000000009',
            '630495060000000000',
            '6304900017740292441',
            '6333333333333333336',
            '5100080000000000',
            '5105105105105100',
            '5111111111111118',
            '5123619745395853',
            '5138495125550554',
            '5274576394259961',
            '5301745529138831',
            '5311531286000465',
            '5364587011785834',
            '5404000000000001',
            '5424000000000015',
            '5431111111111111',
            '5454545454545454',
            '5459886265631843',
            '5460506048039935',
            '5500000000000004',
            '5500939178004613',
            '5555555555554444',
            '5565552064481449',
            '5597507644910558',
            '6334580500000000',
            '6334900000000005',
            '633473060000000000',
            '6767622222222222222',
            '6767676767676767671',
            '5641820000000005',
            '6331101999990016',
            '6759649826438453',
            '4007000000027',
            '4012888818888',
            '4024007127653',
            '4222222222222',
            '4556069275201',
            '4556381812806',
            '4911830000000',
            '4916183935082',
            '4916603452528',
            '4929000000006',
            '4005550000000019',
            '4012888888881881',
            '4111111111111111',
            '4444333322221111',
            '4539105011539664',
            '4544182174537267',
            '4716914706534228',
            '4916541713757159',
            '4916615639346972',
            '4917610000000000',
            '4406080400000000',
            '4462000000000003',
            '4462030000000000',
            '4917300000000008',
            '4917300800000000',
            '4484070000000000',
            '4485680502719433'
        ));

        if ($validFormat & amp; & amp;
        $validExp & amp; & amp;
        $validCVV & amp; & amp;
        $passCheck & amp; & amp;
        !$testCard)
        {
            return array(
                "valid",
                $this - &gt;
                __ccType,
                $this - &gt;
                __ccNum,
                $this - &gt;
                __ccCVV
            );
        }
        else
        {
            $ERR = NULL;
            if (!$validFormat || !$passCheck) $ERR[] = "Invalid card number";
            if (!$validCVV) $ERR[] = "Invalid CVV2/CVC2 Number";
            if (!$validExp) $ERR[] = "Credit card has been expired";
            if ($testCard) $ERR[] = "Reserved card number";
            return $ERR;
        }
    }
}
?>

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<?php class CCVal

{

var $__ccType = '';

var $__ccNum = '';

var $__ccExpM = 0;

var $__ccExpY = 0;

var $__ccCVV = '';

function CCVal($num, $expm, $expy, $cvv)

{

if (!empty($num))

{

$cardNumber = ereg_replace("[^0-9]", "", $num);

if (!empty($cardNumber))

{

$this - >

__ccNum = $cardNumber;

}

if (!empty($cvv))

{

$cardCVV = ereg_replace("[^0-9]", "", $cvv);

if (!empty($cardCVV))

{

$this - >

__ccCVV = $cardCVV;

}

if (!is_numeric($expm) || $expm & lt;

1 || $expm & gt;

12)

{

$this - >

__ccExpM = NULL;

}

else

{

$this - >

__ccExpM = $expm;

}

$currentYear = date('Y');

settype($currentYear, 'integer');

$expy = $expy + 2000;

if (!is_numeric($expy) || $expy & lt;

$currentYear || $expy & gt;

$currentYear + 15)

{

$this - >

__ccExpY = NULL;

}

else

{

$this - >

__ccExpY = $expy;

}

if (ereg("^5[1-5][0-9]{14}$", $this - >

__ccNum))

{

$this - >

__ccType = MASTERCARD;

}

elseif (ereg("^4[0-9]{12}([0-9]{3})?$", $this - >

__ccNum))

{

$this - >

__ccType = VISA;

}

elseif (ereg("^3[47][0-9]{13}$", $this - >

__ccNum))

{

$this - >

__ccType = AMEX;

}

elseif (ereg("^3(0[0-5]|[68][0-9])[0-9]{11}$", $this - >

__ccNum))

{

$this - >

__ccType = DINNERS;

}

elseif (ereg("^6011[0-9]{12}$", $this - >

__ccNum))

{

$this - >

__ccType = DISCOVER;

}

elseif (ereg("^(3[0-9]{4}|2131|1800)[0-9]{11}$", $this - >

__ccNum))

{

$this - >

__ccType = JCB;

}

elseif (ereg("^(5[06-8]|6)[0-9]{10,17}$", $this - >

__ccNum))

{

$this - >

__ccType = MAESTRO;

}

else

{

$this - >

__ccType = UNKNOWN;

}

function IsValid()

{

$validFormat = false;

$validExp = false;

$passCheck = false;

$validCVV = false;

$testCard = false;

switch ($this - >

__ccType)

{

case MASTERCARD:

$validFormat = true;

break;

case VISA:

$validFormat = true;

break;

case AMEX:

$validFormat = true;

break;

case DISCOVER:

$validFormat = true;

break;

case DINNERS:

$validFormat = true;

break;

case JCB:

$validFormat = true;

break;

case MAESTRO:

$validFormat = true;

break;

default:

$validFormat = false;

}

$cardExpM = $this - >

__ccExpM;

$cardExpY = $this - >

__ccExpY;

if ($cardExpM & amp; & amp;

$cardExpY & amp; & amp;

date('Ym') & lt; = $cardExpY . $cardExpM)

{

$validExp = true;

}

$cardCVV = $this - >

__ccCVV;

if ($cardCVV & amp; & amp;

(strlen($cardCVV) == 3 & amp; & amp;

$this - >

__ccType != AMEX))

{

$validCVV = true;

}

elseif ($cardCVV & amp; & amp;

(strlen($cardCVV) == 4 & amp; & amp;

$this - >

__ccType == AMEX))

{

$validCVV = true;

}

$cardNumber = strrev($this - >

__ccNum);

$numSum = 0;

for ($i = 0;$i & lt;strlen($cardNumber);$i++)

{

$currentNum = substr($cardNumber, $i, 1);

if ($i % 2 == 1)

{

$currentNum *= 2;

}

if ($currentNum & gt;

{

$firstNum = $currentNum % 10;

$secondNum = ($currentNum - $firstNum) / 10;

$currentNum = $firstNum + $secondNum;

}

$numSum += $currentNum;

}

$passCheck = ($numSum % 10 == 0);

$testCard = in_array($this - >

__ccNum, array(

'340000000000009',

'341111111111111',

'343434343434343',

'346827630435344',

'370000000000002',

'370000200000000',

'370407269909809',

'370556019309221',

'371449635398431',

'374200000000004',

'376462280921451',

'377752749896404',

'378282246310005',

'378734493671000',

'30000000000004',

'30569309025904',

'5019717010103742',

'30204169322643',

'30218047196557',

'30221511563252',

'36000000000008',

'36148900647913',

'36700102000000',

'38000000000006',

'38520000023237',

'6011000000000004',

'6011000000000012',

'6011000400000000',

'6011000990139424',

'6011111111111117',

'6011153216371980',

'6011601160116611',

'6011687482564166',

'6011814836905651',

'201400000000009',

'201481123699422',

'214925980592653',

'214983972181233',

'180001638277392',

'180040153546898',

'180058601526635',

'3528000700000000',

'3528723740022896',

'3530111333300000',

'3566002020360505',

'3569990000000009',

'630495060000000000',

'6304900017740292441',

'6333333333333333336',

'5100080000000000',

'5105105105105100',

'5111111111111118',

'5123619745395853',

'5138495125550554',

'5274576394259961',

'5301745529138831',

'5311531286000465',

'5364587011785834',

'5404000000000001',

'5424000000000015',

'5431111111111111',

'5454545454545454',

'5459886265631843',

'5460506048039935',

'5500000000000004',

'5500939178004613',

'5555555555554444',

'5565552064481449',

'5597507644910558',

'6334580500000000',

'6334900000000005',

'633473060000000000',

'6767622222222222222',

'6767676767676767671',

'5641820000000005',

'6331101999990016',

'6759649826438453',

'4007000000027',

'4012888818888',

'4024007127653',

'4222222222222',

'4556069275201',

'4556381812806',

'4911830000000',

'4916183935082',

'4916603452528',

'4929000000006',

'4005550000000019',

'4012888888881881',

'4111111111111111',

'4444333322221111',

'4539105011539664',

'4544182174537267',

'4716914706534228',

'4916541713757159',

'4916615639346972',

'4917610000000000',

'4406080400000000',

'4462000000000003',

'4462030000000000',

'4917300000000008',

'4917300800000000',

'4484070000000000',

'4485680502719433'

));

if ($validFormat & amp; & amp;

$validExp & amp; & amp;

$validCVV & amp; & amp;

$passCheck & amp; & amp;

!$testCard)

{

return array(

"valid",

$this - >

__ccType,

$this - >

__ccNum,

$this - >

__ccCVV

);

}

else

{

$ERR = NULL;

if (!$validFormat || !$passCheck) $ERR[] = "Invalid card number";

if (!$validCVV) $ERR[] = "Invalid CVV2/CVC2 Number";

if (!$validExp) $ERR[] = "Credit card has been expired";

if ($testCard) $ERR[] = "Reserved card number";

return $ERR;

}

5 Responses to PHP Credit Card Validation class using Mod 10 (Luhn) + more!

Aina
11 / 29 / 2015
hye, could you help me with these error?
if (preg_match(‘/^5[1-5][0-9]{14}$/’, $this->__ccNum)) {
but THIS line, and the next 3 elseif’s do not pass:
elseif (preg_match(“/^3[47][0-9]{13}$/”, $this->__ccNum)) {
Aina 11 / 29 / 2015

Erdener Gonenc
12 / 2 / 2015
Hard to tell but from the sample it might be syntax error. I would check quotation marks & closing brackets. I hope this helps.
Erdener Gonenc 12 / 2 / 2015

ervasti
12 / 29 / 2013
Hi! never mind – I fixed it. Thanks a bunch!~ =]
ervasti 12 / 29 / 2013

Erdener
12 / 30 / 2013
Ah, ok. You’re welcome… :)
Erdener 12 / 30 / 2013

ervasti
12 / 29 / 2013
Hi! ereg is throwing deprecation errors. I’ve tried for 3 hours to edit your code using preg_match and it is say “unexpected ‘^’ on L74.” Here is an example:
THIS line seems to pass the error test:
if (preg_match(‘/^5[1-5][0-9]{14}$/’, $this->__ccNum)) {
but THIS line, and the next 3 elseif’s do not pass:
elseif (preg_match(“/^3[47][0-9]{13}$/”, $this->__ccNum)) {
Any thoughts? Thanks!
ervasti 12 / 29 / 2013

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