I have a very basic script on my web site:
<?php // start session // import selected size into session session_start(); $_SESSION['colour'] = $_GET['c']; header("Location: " . $_SERVER['HTTP_REFERER']); ?>
The only value I expect from $_GET[‘c’] is either ‘black’,‘white’ or ‘green’.
Is there any way I can filter this so the script will only accept a value from these values and exits if it receives anything different.