Online Shopping in PHP

The_B_Man

Does anyone know how i can do credit card verification for an online shop in PHP? would it be possible to write it myself or would i have to download a class for it? any help is appreciated.

Seth Brundle

How are you going to verify someones credit card?
You need to pass their info onto the likes of realex or whatever.

leeroybrown

If you're talking about doing actual credit card transactions (as opposed to some demo for a project) then you'll need to go through a company who are authorised for online transaction validation. They'll supply the necessary secure e-commerce plugins for your transactions.

The_B_Man

no sorry, i should've been clearer. its not for real. it'd be more for the project demo scenario than for actual credit card transactions. i'm lookin for something along the lines of making sure they're all numbers and in the format of a proper credit card ie 15 digits or however many it is.

Seth Brundle

then just check that it is 16 digits long, they enter the type of card, its expiry date and maybe the 3 digit serial code on the back of the card.

The_B_Man

Thanks but how do i check it for numbers? whats the name of the function? i know there was one in ASP, i think, called "isnumeric", but i dont know what it is in PHP. I'm just tryin to get this stuff ready. i havent actually started coding and im just starting to actually learn PHP, so forgive me for being a little clueless.

Seth Brundle

www.php.net/docs.php

The_B_Man

nice thanx.

chakotha

This is a way of validating card number formats I came across.

http://www.beachnet.com/~hstiles/cardtype.html

A function to do it is
[PHP]<?
/************************************************************************
*
* CCVal - Credit Card Validation function.
*
* Copyright (c) 1999 Holotech Enterprises. All rights reserved.
* You may freely modify and use this function for your own purposes. You
* may freely distribute it, without modification and with this notice
* and entire header intact.
*
* This function accepts a credit card number and, optionally, a code for
* a credit card name. If a Name code is specified, the number is checked
* against card-specific criteria, then validated with the Luhn Mod 10
* formula. Otherwise it is only checked against the formula. Valid name
* codes are:
*
* mcd - Master Card
* vis - Visa
* amx - American Express
* dsc - Discover
* dnc - Diners Club
* jcb - JCB
*
* A description of the criteria used in this function can be found at
* http://www.beachnet.com/~hstiles/cardtype.html. If you have any
* questions or comments, please direct them to ccval@holotech.net
*
* Alan Little
* Holotech Enterprises
* http://www.holotech.net/
* September 1999
*
************************************************************************/

function CCVal($Num, $Name = 'n/a') {

// Innocent until proven guilty
$GoodCard = true;

// Get rid of any non-digits
$Num = ereg_replace("[^[:digit:]]", "", $Num);

// Perform card-specific checks, if applicable
switch ($Name) {

case "mcd" :
$GoodCard = ereg("^5[1-5].{14}$", $Num);
break;

case "vis" :
$GoodCard = ereg("^4.{15}$|^4.{12}$", $Num);
break;

case "amx" :
$GoodCard = ereg("^3[47].{13}$", $Num);
break;

case "dsc" :
$GoodCard = ereg("^6011.{12}$", $Num);
break;

case "dnc" :
$GoodCard = ereg("^30[0-5].{11}$|^3[68].{12}$", $Num);
break;

case "jcb" :
$GoodCard = ereg("^3.{15}$|^2131|1800.{11}$", $Num);
break;
}

// The Luhn formula works right to left, so reverse the number.
$Num = strrev($Num);

$Total = 0;
for ($x=0; $x<strlen($Num); $x++) {
$digit = substr($Num,$x,1);

// If it's an odd digit, double it
if ($x/2 != floor($x/2)) {
$digit *= 2;
// If the result is two digits, add them
if (strlen($digit) == 2)
$digit = substr($digit,0,1) + substr($digit,1,1);
}
// Add the current digit, doubled and added if applicable, to the Total
$Total += $digit;
}
// If it passed (or bypassed) the card-specific check and the Total is
// evenly divisible by 10, it's cool!
if ($GoodCard && $Total % 10 == 0) return true; else return false;

return true;
}
if (CCVal("4111111111111111", "vsa")) {
echo("Good Card");
} else {
echo("Bad Card");
}
?>
[/PHP]
You might want to test it on the various cards using test numbers. I have only tested it for Visa and Mastercard