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Creditcard Validation
By: Codewalkers
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    2002-01-18

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    Check if a creditcard is valid without sending information to an outside website. AMEX, VISA and MASTERCARD supported.

    By : smckone

    This script is object orianted but I included a simple wrapper funtion.
    It makes it easy by just entering the card number and returning a boolean true or false;

    boolean IsCardValid(int);
    boolean IsCardValid(string);

    <?php
    /**************************************************
    Credit Card Validation
    Check if a creditcard is valid without
    sending information to an outside
    website. AMEX, VISA and MASTERCARD supported.

    Sam McKone <sam@evilwalrus.com>

    v1.0 (Dec 5. 2001)
    ***************************************************/

    class CCValidation{
    // static variables
    var $INVALID = -1;
    var $VISA = 1;
    var $MASTERCARD = 2;
    var $AMEX = 3;
    var $CARD_NAMES = array("Visa","Mastercard","American Express");

    // data members
    var $CardNumber = "";

    function CCValidation($set_num){
    $this->CardNumber = $set_num;

    }
    function setCardNumber($set_num){
    $this->CardNumber = $set_num;
    }
    function CheckCardID(){
    $valid = $INVALID;

    $digits1 = substr($this->CardNumber,0,1);
    $digits2 = substr($this->CardNumber,0,2);
    $digits4 = substr($this->CardNumber,0,4);

    if($digit1 == 4){
    if(strlen($this->CardNumber) == 13 || strlen($this->CardNumber) == 16){
    $valid = $VISA;
    }
    }else if($digit2 >= 51 && $digit2 <= 55){
    if(strlen($this->CardNumber) == 16){
    $valid = $MASTERCARD;
    }
    }else if($digit2 == 34 || $digit2 == 37){
    if(strlen($this->CardNumber) == 15){
    $valid = $AMEX;
    }
    }
    return $valid;
    }
    function CheckCardNumber(){
    $cardTemp = $this->CardNumber;
    $checkSum = 0;

    for($i = (strlen($cardTemp) -1);$i >= 0; $i -= 2){
    $j = 0;
    if(i > 0){
    $j = substr($cardTemp,$i-1,$i) * 2;
    if($j > 9){
    $s = $j;
    $j = substr($s,0,1) + substr($s,1);
    }
    $checkSum += substr($s,0,1) + $j;
    }else{
    $checkSum += substr($cardTemp,0,1);
    }
    }
    return (($checkSum % 10) == 0);
    }
    function CheckCard(){
    if($this->CheckCardID() != -1){
    return $this->CheckCardNumber();
    }
    return false;
    }
    }
    function IsCardValid($card_num){
    $card = new CCValidation($card_num);
    return $card->CheckCard();
    }
    ?>
    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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