<?php
    //  shipping.php contains our get_shipping_options($zipcode, $pounds) function.
    //  It returns an array mapping service name to price in US dollars.
    require ('shipping.php');

    $options = get_shipping_options($_REQUEST[zipcode], $_REQUEST[pounds]);
    foreach ($options as $service => $price) {
        $result[] = "$service: $price USD";
    }
    print implode("\n", $result);
?>