C:/xampp/htdocs/moodle/lib/zend/Zend/Service/Amazon/Ec2/Instance/Reserved.php

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<?php
require_once 'Zend/Service/Amazon/Ec2/Abstract.php';

class Zend_Service_Amazon_Ec2_Instance_Reserved extends Zend_Service_Amazon_Ec2_Abstract
{
    public function describeInstances($instanceId)
    {
        $params = array();
        $params['Action'] = 'DescribeReservedInstances';

        if(is_array($instanceId) && !empty($instanceId)) {
            foreach($instanceId as $k=>$name) {
                $params['ReservedInstancesId.' . ($k+1)] = $name;
            }
        } elseif($instanceId) {
            $params['ReservedInstancesId.1'] = $instanceId;
        }

        $response = $this->sendRequest($params);

        $xpath = $response->getXPath();
        $items = $xpath->query('//ec2:reservedInstancesSet/ec2:item');

        $return = array();
        foreach($items as $item) {
            $i = array();
            $i['reservedInstancesId'] = $xpath->evaluate('string(ec2:reservedInstancesId/text())', $item);
            $i['instanceType'] = $xpath->evaluate('string(ec2:instanceType/text())', $item);
            $i['availabilityZone'] = $xpath->evaluate('string(ec2:availabilityZone/text())', $item);
            $i['duration'] = $xpath->evaluate('string(ec2:duration/text())', $item);
            $i['fixedPrice'] = $xpath->evaluate('string(ec2:fixedPrice/text())', $item);
            $i['usagePrice'] = $xpath->evaluate('string(ec2:usagePrice/text())', $item);
            $i['productDescription'] = $xpath->evaluate('string(ec2:productDescription/text())', $item);
            $i['instanceCount'] = $xpath->evaluate('string(ec2:instanceCount/text())', $item);
            $i['state'] = $xpath->evaluate('string(ec2:state/text())', $item);

            $return[] = $i;
            unset($i);
        }

        return $return;
    }

    public function describeOfferings()
    {
        $params = array();
        $params['Action'] = 'DescribeReservedInstancesOfferings';

        $response = $this->sendRequest($params);

        $xpath = $response->getXPath();
        $items = $xpath->query('//ec2:reservedInstancesOfferingsSet/ec2:item');

        $return = array();
        foreach($items as $item) {
            $i = array();
            $i['reservedInstancesOfferingId'] = $xpath->evaluate('string(ec2:reservedInstancesOfferingId/text())', $item);
            $i['instanceType'] = $xpath->evaluate('string(ec2:instanceType/text())', $item);
            $i['availabilityZone'] = $xpath->evaluate('string(ec2:availabilityZone/text())', $item);
            $i['duration'] = $xpath->evaluate('string(ec2:duration/text())', $item);
            $i['fixedPrice'] = $xpath->evaluate('string(ec2:fixedPrice/text())', $item);
            $i['usagePrice'] = $xpath->evaluate('string(ec2:usagePrice/text())', $item);
            $i['productDescription'] = $xpath->evaluate('string(ec2:productDescription/text())', $item);

            $return[] = $i;
            unset($i);
        }

        return $return;
    }

    public function purchaseOffering($offeringId, $intanceCount = 1)
    {
        $params = array();
        $params['Action'] = 'PurchaseReservedInstancesOffering';
        $params['OfferingId.1'] = $offeringId;
        $params['instanceCount.1'] = intval($intanceCount);

        $response = $this->sendRequest($params);

        $xpath = $response->getXPath();
        $reservedInstancesId = $xpath->evaluate('string(//ec2:reservedInstancesId/text())');

        return $reservedInstancesId;
    }
}