PHP

Creating a Credit Card Validation Class With PHP

One of the most important functions of any eCommerce web site is credit card number storage and validation. In this article David develops a PHP class that stores the details of a credit card and validates its number using the Mod 10 algorithm.

Author Info:

By: David Rusik

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Rating:

/ 40

February 25, 2002

TABLE OF CONTENTS:

Creating a Credit Card Validation Class With PHP - Using our CCreditCard class
(Page 5 of 6 )

Create a new file called testcc.php and save it in the same directory as the class.creditcard.php file. Enter the following code into testcc.php:

<?php include('class.creditcard.php'); ?>

<?php

global $submit;

if(!isset($submit))

{

?>

<h2>Validate Credit Card</h2>

<form name="frmCC" action="cctest.php" method="post">

Cardholders name: <input type="text" name="ccName"><br>

Card number: <input type="text" name="ccNum"><br>

Card type: <select name="ccType">

<option value="1">mastercard</option>

<option value="2">Visa</option>

<option value="3">Amex</option>

<option value="4">Diners</option>

<option value="5">Discover</option>

<option value="6">JCB</option>

</select><br>

Expiry Date: <select name="ccExpM">

<?php

for($i = 1; $i < 13; $i++)

{ echo '<option>' . $i . '</option>'; }

?>

</select>

<select name="ccExpY">

<?php

for($i = 2002; $i < 2013; $i++)

{ echo '<option>' . $i . '</option>'; }

?>

</select><br><br>

<input type="submit" name="submit" value="Validate">

</form>

<?

}

else

{

// Check if the card is valid

global $ccName;

global $ccNum;

global $ccType;

global $ccExpM;

global $ccExpY;

$cc = new CCreditCard($ccName, $ccType, $ccNum, $ccExpM, $ccExpY);

?>

<h2>Validation Results</h2>

<b>Name: </b><?php echo $cc->Name(); ?><br>

<b>Number: </b><?php echo $cc->SafeNumber('x', 6); ?><br>

<b>Type: </b><?php echo $cc->Type(); ?><br>

<b>Expires: </b><?php echo $cc->ExpiryMonth() . '/' . $cc->ExpiryYear(); ?><br><br>

<font color="blue" size="2"><b>

<?php

if($cc->IsValid())

echo "VALID CARD";

else

echo "INVALID CARD";

echo "</b></font>";

}

?>

Run the script in your browser. Here are two screen shots from my browser. The first one shows the HTML form, and the second shows the output once the form is submitted:

Entering the cards details