adding php files for second exercise

src/02-shipping/docroot/plainHttpService.php

@@ -0,0 +1,11 @@
+<?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);
+?>

src/02-shipping/docroot/shipping.php

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+<?php
+
+    //  Returns an array of made-up shipping options.
+    function get_shipping_options($zipcode, $pounds) {
+        $baseCost = round($zipcode / 10000) + ($pounds * 5);
+        $options = array( "Next Day" => $baseCost * 4,
+                            "Two Day Air" => $baseCost * 2,
+                            "Saver Ground" => $baseCost);
+        return $options;
+    }
+
+?>

src/02-shipping/docroot/xmlHttpService.php

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+<?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"]);
+
+    $results[] = "<options>";
+    foreach ($options as $service => $price) {
+        $results[] = "<option><service>$service</service><price>$price</price></option>";
+    }
+    $results[] = "</options>";
+    print implode("\n", $results);
+?>