<?php
if (isset($_GET['currency']))
    {
        if ($_GET['currency'] == 'USD') {
        $currency = $_GET['currency'];
        $time = time()+31536000;
        setcookie ("currency", $currency , $time);
        }
        else if ($_GET['currency'] == 'EUR') {
        $currency = $_GET['currency'];
        $time = time()+31536000;
        setcookie ("currency", $currency , $time);
        }
        else if ($_GET['currency'] == 'GBP') {
        $currency = $_GET['currency'];
        $time = time()+31536000;
        setcookie ("currency", $currency , $time);
        }
        else {
        $currency = 'GBP';
        $time = time()+31536000;
        setcookie ("currency", $currency , $time);
        }
    }
else if (isset($_COOKIE['currency']))
    {
        $currency = ($_COOKIE["currency"]);
        }
else
        $currency = 'GBP';
?>