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

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

class Zend_Service_Amazon_Ec2_Elasticip extends Zend_Service_Amazon_Ec2_Abstract
{
    public function allocate()
    {
        $params = array();
        $params['Action'] = 'AllocateAddress';

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

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

        return $ip;
    }

    public function describe($publicIp = null)
    {
        $params = array();
        $params['Action'] = 'DescribeAddresses';

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

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

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

        $return = array();
        foreach ($nodes as $k => $node) {
            $item = array();
            $item['publicIp']  = $xpath->evaluate('string(ec2:publicIp/text())', $node);
            $item['instanceId']   = $xpath->evaluate('string(ec2:instanceId/text())', $node);

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

        return $return;
    }

    public function release($publicIp)
    {
        $params = array();
        $params['Action'] = 'ReleaseAddress';
        $params['PublicIp'] = $publicIp;

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

        $return = $xpath->evaluate('string(//ec2:return/text())');

        return ($return === "true");
    }

    public function associate($instanceId, $publicIp)
    {
        $params = array();
        $params['Action'] = 'AssociateAddress';
        $params['PublicIp'] = $publicIp;
        $params['InstanceId'] = $instanceId;

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

        $return = $xpath->evaluate('string(//ec2:return/text())');

        return ($return === "true");
    }

    public function disassocate($publicIp)
    {
        $params = array();
        $params['Action'] = 'DisssociateAddress';
        $params['PublicIp'] = $publicIp;

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

        $return = $xpath->evaluate('string(//ec2:return/text())');

        return ($return === "true");
    }

}