A Zend Framework class to fetch EC2 instance meta-data

ec2.php

#!/usr/bin/env php
<?php
require_once 'Zircote/Service/Ec2.php';
$ec2 = new Zircote_Service_Ec2();

echo $ec2->__get($_SERVER['argv'][1]);

Jazsl_Service_Ec2.php

<?php
class Zircote_Service_Ec2
{
    /**
     *
     * @var Zend_Http_Client
     */
    protected $_httpClient;
    protected $_endpoint = 'http://169.254.169.254';
    protected $_methods = array(
        'amiID' => '/latest/meta-data/ami-id',
        'amiLaunchIndex' => '/latest/meta-data/ami-launch-index',
        'amiManifestPath' => '/latest/meta-data/ami-manifest-path',
        'ancestorAmiIds' => '/latest/meta-data/ancestor-ami-ids',
        'blockDeviceMapping' => '/latest/meta-data/block-device-mapping/',
        'hostname' => '/latest/meta-data/hostname',
        'instanceAction' => '/latest/meta-data/instance-action',
        'instanceId' => '/latest/meta-data/instance-id',
        'instanceType' => '/latest/meta-data/instance-type',
        'kernelId' => '/latest/meta-data/kernel-id',
        'localHostname' => '/latest/meta-data/local-hostname',
        'localIpv4' => '/latest/meta-data/local-ipv4',
        'placement' => '/latest/meta-data/placement/',
        'publicHostname' => '/latest/meta-data/public-hostname',
        'publicIpv4' => '/latest/meta-data/public-ipv4',
        'publicKeys' => '/latest/meta-data/public-keys/',
        'ramdiskId' => '/latest/meta-data/ramdisk-id',
        'reservationId' => '/latest/meta-data/reservation-id',
        'securityGroups' => '/latest/meta-data/security-groups',
        'userData' => '/latest/user-data',
    );
    public function __construct ()
    {
        require_once 'Zend/Http/Client.php';
        $this->_httpClient = new Zend_Http_Client($this->_endpoint);
    }

    public function __get($name)
    {
        if(!array_key_exists($name, $this->_methods)){
            throw new Exception(sprintf('value [%s] does not exist', $name));
        }
        $this->_httpClient->getUri()->setPath($this->_methods[$name]);
        $result = $this->_httpClient->request();
        if($result->getStatus() == 200){
            return $result->getBody();
        } else {
            return false;
        }
    }
}