This Script can be used to start / stop instances on amazon EC2

Shutdown Script

<?php
require_once 'sdk/sdk.class.php';


$hosts = array(
    'linux' => array('id' => 'i-123ee456', 'ip' => '1.2.3.4'),
    'windows' => array('id' => 'i-123ee457', 'ip' => '1.2.3.5'),
);


$ec2 = new AmazonEC2();
$ec2->set_region(AmazonEC2::REGION_EU_W1);

switch ($argv[1]) {
case 'start':
    start($ec2, $hosts);
    break;
case 'stop':
    stop ($ec2, $hosts);
    break;
default:
    echo "Enter start or stop as parameter\n";
    break;
}

function stop($ec2, $hosts) {
    outPut("Going to stop ".count($hosts)." instances, please Wait...\n");

    foreach ($hosts as $host) {
        $response = $ec2->stop_instances($host['id']);
        if (!$response->isOK()) {
            outPut("Something went wrong\n");
            var_dump($response);
            die();
        }
        $stopped = false;
        outPut("Waiting for ".$host['id']." to stop");
        while(!$stopped) {
            $response = $ec2->describe_instances(array("InstanceId" => $host['id']));
            $status = (string) $response->body->reservationSet->item[0]->instancesSet->item[0]->instanceState->name;
            if ((string)$status !== 'stopped') {
                outPut(".");
                sleep(5);
                continue;
            }
            $stopped = true;
            outPut("\nHost".$host['id']." successfully stopped\n");
        }
        $ec2->disassociate_address($host['ip']);
    }
}


function start($ec2, $hosts) {
    outPut("Going to start ".count($hosts)." instances, please Wait...\n");

    foreach ($hosts as $host) {
        print "\n";

        if (GetPing($host['ip'])) {
            outPut($host['id']." is Already online\n");
            continue;
        }

        $response = $ec2->start_instances($host['id']);
        if (!$response->isOK()) {
            outPut("Something went wrong\n");
            var_dump($response);
            die();
        }

        $started = $online = false;

        outPut("Waiting till ".$host['id']." is booted");

        while (!$started) {
            $response = $ec2->describe_instances(array("InstanceId" => $host['id']));
            $status = (string) $response->body->reservationSet->item[0]->instancesSet->item[0]->instanceState->name;

            if ((string)$status !== 'running') {
                outPut(".");
                sleep(5);
                continue;
            }
            print "\n";
            $started = true;
        }

        $response = $ec2->associate_address($host['id'], $host['ip']);
        if (!$response->isOK()) {
           outPut("Something went wrong\n");
           die();
        }

        outPut("Waiting for ".$host['id']." to respond to pings");

        while (!$online) {
            if (GetPing($host['ip'])) {
                print "\n";
                outPut($host['id']."is now Online\n");
                $online = true;
            } else {
                outPut(".");
                sleep(5);
            }
        }

    }
}

function GetPing($ip) {
    $exec = exec("ping -c 2 -s 64 -t 64 ".$ip);
    if (strpos($exec, '0 packets received') !== false) {
        return false;
    }
    return true;
}

function outPut($str) {
    print $str;
    flush();
    @ob_flush();
}