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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

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;
	}

?>

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License

__ccNum = $cardNumber; 
	  } 
	} 

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

	if(!is_numeric($expm) || $expm < 1 || $expm > 12) 
	{ 
	  $this->__ccExpM =NULL;
	} 
	else 
	{ 
	  $this->__ccExpM = $expm; 
	} 

	$currentYear = date('Y');
	settype($currentYear, 'integer');
	$expy=$expy+2000;
	if(!is_numeric($expy) || $expy < $currentYear || $expy > $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 && $cardExpY && date('Ym')<=$cardExpY.$cardExpM) {
$validExp = true;
}

$cardCVV = $this->__ccCVV; 

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

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

for($i = 0; $i < strlen($cardNumber); $i++) 
{ 
  $currentNum = substr($cardNumber, $i, 1); 

if($i % 2 == 1) 
{ 
  $currentNum *= 2; 
} 

if($currentNum > 9) 
{ 
  $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 && $validExp && $validCVV && $passCheck && !$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;
  }
 } 
} 
?>