PHP Code.

[Aasixx]

Well, I'm using Derpstra's wonderful PHP code (thank you for posting it, Derpstra!) and I was wondering if there was a way to make it where you cannot refresh that page or go back. I'm using this page for when they purchase a certain amount of cash for real money that they're sent to this page to automatically gain their purchased cash. But, I noticed, when you refresh/press go back, they can easily cheat and gain a lot of cash for free. I want to make it where they cannot cheat. Is this possible?

Code:

PHP Code:

<?php

include("functions/functions.php");
include("functions/functions_users.php");
include("functions/functions_adopts.php");
include("functions/functions_friends.php");
include("functions/functions_items.php");
include("inc/lang.php");
include("inc/bbcode.php");

//***************//
// START SCRIPT //
//***************//

$cashname = grabanysetting("cost");
$reward= 1;

if($isloggedin == "yes"){
changecash($reward, $GLOBALS['username'], $GLOBALS['money']);
$article_title = "Hello, {$username}!";
$article_content = "You have gained {$reward} {$cashname}.";
}
else{
$article_title = "You are not logged in!";
$article_content = "You must be logged in to view this page!";
}

//***************//
// OUTPUT PAGE //
//***************//

echo showpage($article_title, $article_content, $date);
?>