<?
define("CARD_TYPE_MC", 0); 
define("CARD_TYPE_VS", 1); 
define("CARD_TYPE_AX", 2); 
define("CARD_TYPE_DC", 3); 
define("CARD_TYPE_DS", 4); 
define("CARD_TYPE_JC", 5);
define("CARD_TYPE_LR", 6);

class CCreditCard { 
	// Class Members 
	var $__ccName = ''; 
	var $__ccType = ''; 
	var $__ccNum = ''; 
	var $__ccExpM = 0; 
	var $__ccExpY = 0;
	var $_ccMissingGear = 0;
	
	// Constructor 
	function CCreditCard($name, $type, $num, $expm, $expy) {
		// Set member variables 
			if(!empty($name)) { 
				$this->__ccName = $name; 
			} 
			
		// Make sure card type is valid 
		switch(strtolower($type)) {   
			case 'mc':   
			case 'mastercard':   
			case 'm':   
			case '1':     
				$this->__ccType = CARD_TYPE_MC;     
				break;   
			case 'vs':   
			case 'visa':   
			case 'v':   
			case '2':     
				$this->__ccType = CARD_TYPE_VS;     
				break;   
			case 'ax':   
			case 'american express':   
			case 'a':   
			case '3':     
				$this->__ccType = CARD_TYPE_AX;     
				break;   
			case 'dc':   
			case 'diners club':   
			case '4':     
				$this->__ccType = CARD_TYPE_DC;     
				break;   
			case 'ds':   
			case 'discover':   
			case '5':     
				$this->__ccType = CARD_TYPE_DS;     
				break; 
			case 'jc':   
			case 'jcb':   
			case '6':     
				$this->__ccType = CARD_TYPE_JC;     
				break;   
			case 'ls':   
			case 'laser':   
			case '7':     
				$this->__ccType = CARD_TYPE_LR;     
				break;   
			default:     
				die('Invalid type ' . $type . ' passed to constructor'); 
		}
		
		// Don't check the number yet just kill all non numerics 
		if(!empty($num)) {  
			$cardNumber = ereg_replace("[^0-9]", "", $num);   
		// Make sure the card number isnt empty   
			if(!empty($cardNumber))   {     
				$this->__ccNum = $cardNumber;   
			} 
		} 
			
		if(!is_numeric($expm) || $expm < 1 || $expm > 12) {   
			$this->_ccMissingGear = 1;  
		} else {   
			$this->__ccExpM = $expm; } 
		
		// Get the current year 
		$currentYear = date('Y'); 
		settype($currentYear, 'integer'); 
		if(!is_numeric($expy) || $expy < $currentYear || $expy > $currentYear + 10) {   
			$this->_ccMissingGear = 1;  
		} else {   
			$this->__ccExpY = $expy; } 
	}
	
	function Name() {   
		return $this->__ccName; 
	} 
	
	function Type() {   
		switch($this->__ccType)     {     
			case CARD_TYPE_MC:       
				return 'mastercard [1]';       
				break;     
			case CARD_TYPE_VS:       
				return 'Visa [2]';       
				break;    
			case CARD_TYPE_AX:       
				return 'Amex [3]';      
				break;    
			case CARD_TYPE_DC:       
				return 'Diners Club [4]';       
				break;     
			case CARD_TYPE_DS:      
				return 'Discover [5]';      
				break;     
			case CARD_TYPE_JC:       
				return 'JCB [6]';       
				break;     
			case CARD_TYPE_LR:       
				return 'Laser [7]';       
				break;     
			default:       
				return 'Unknown [-1]';   
		} 
	} 
	
	function Number() {  
		return $this->__ccNum; 
	} 
	
	function ExpiryMonth() {   
		return $this->__ccExpM; 
	} 
	
	function ExpiryYear() {   
		return $this->__ccExpY; 
	}
	
	function SafeNumber($char = 'x', $numToHide = 4) {   
		// Return only part of the number   
		if($numToHide < 4)   {     
			$numToHide = 4;   }   
		if($numToHide > 10)   {     
			$numToHide = 10;   }   
		$cardNumber = $this->__ccNum;   
		$cardNumber = substr($cardNumber, 0, strlen($cardNumber) - $numToHide);   
		for($i = 0; $i < $numToHide; $i++)   {     
			$cardNumber .= $char;   
		}   
		return $cardNumber; 
	}
	
	function IsValid() {   
		// Not valid by default   
		$validFormat = false;   
		$passCheck = false;
		$expiryCheck = true;
			
		
		$currentMonth = date('m'); 
		$currentY = date('Y'); 
		$expMonth = $this->__ccExpM;
		$expYear = $this->__ccExpY;
		settype($currentMonth, 'integer');
		settype($currentY, 'integer');
		settype($expYear, 'integer');
		settype($expMonth, 'integer'); 
		if(($expYear == $currentY) && ($expMonth < $currentMonth)) {   
			$expiryCheck = false;
		}
		
		// Is the number in the correct format? 
		switch($this->__ccType) {   
			case CARD_TYPE_MC:     
				$validFormat = ereg("^5[1-5][0-9]{14}$", $this->__ccNum);     
				break;
			case CARD_TYPE_VS:     
				$validFormat = ereg("^4[0-9]{12}([0-9]{3})?$", $this->__ccNum);     
				break; 
			case CARD_TYPE_AX:     
				$validFormat = ereg("^3[47][0-9]{13}$", $this->__ccNum);     
				break; 
			case CARD_TYPE_DC:     
				$validFormat = ereg("^3(0[0-5]|[68][0-9])[0-9]{11}$", $this->__ccNum);     
				break; 
			case CARD_TYPE_DS:     
				$validFormat = ereg("^6011[0-9]{12}$", $this->__ccNum);     
				break; 
			case CARD_TYPE_JC:     
				$validFormat = ereg("^(3[0-9]{4}|2131|1800)[0-9]{11}$", $this->__ccNum);     
				break;  
			case CARD_TYPE_LR:     
				$validFormat = ereg("^(6[0-9]{15}|6[0-9]{17}|6[0-9]{18})$", $this->__ccNum);     
				break;  
			default:   
				// Should never be executed   
				$validFormat = false; 
		}
		
		// Is the number valid? 
		$cardNumber = strrev($this->__ccNum); 
		$numSum = 0; 
		for($i = 0; $i < strlen($cardNumber); $i++) {   
			$currentNum = substr($cardNumber, $i, 1); 
			// Double every second digit 
			if($i % 2 == 1) {   
				$currentNum *= 2; } 
			// Add digits of 2-digit numbers together 
			if($currentNum > 9) {   
				$firstNum = $currentNum % 10;   
				$secondNum = ($currentNum - $firstNum) / 10;   
				$currentNum = $firstNum + $secondNum; 
			} 
		$numSum += $currentNum;
		}
		
		// If the total has no remainder it's OK 
		$passCheck = ($numSum % 10 == 0);
		settype($mG, 'integer'); 
		if($validFormat && $passCheck && $expiryCheck) 
			return true;   
		else 
			return false;  
	} 
}
?>