gistfile1.php

<?
include "aws/sdk.class.php";

$config = array();
$config['key'] = 'key';
$config['secret'] = 'secret';
$config['region'] = 'us-east-1d';
$ec2Client = \Aws\Ec2\Ec2Client::factory($config);
$result = $ec2Client->DescribeInstances(array(
        'Filters' => array(
                array('Name' => 'instance-type', 'Values' => array('m1.small')),
        )
));

echo "<pre>";
print_r($result);
echo "</pre>";
echo "<br/><br/>";


$reservations = $result['Reservations'];
foreach ($reservations as $reservation) {
    $instances = $reservation['Instances'];
    foreach ($instances as $instance) {

        $instanceName = '';
        foreach ($instance['Tags'] as $tag) {
            if ($tag['Key'] == 'Name') {
                $instanceName = $tag['Value'];
            }
        }


        echo 'Instance Name: ' . $instanceName . PHP_EOL;
        echo '---> State: ' . $instance['State']['Name'] . PHP_EOL;
        echo '---> Instance ID: ' . $instance['InstanceId'] . PHP_EOL;
        echo '---> Image ID: ' . $instance['ImageId'] . PHP_EOL;
        echo '---> Private Dns Name: ' . $instance['PrivateDnsName'] . PHP_EOL;
        echo '---> Instance Type: ' . $instance['InstanceType'] . PHP_EOL;
        echo '---> Security Group: ' . $instance['SecurityGroups'][0]['GroupName'] . PHP_EOL;
    }

}
?>


// OUTPUT:
// PHP Fatal error:  Class 'Aws\\Ec2\\Ec2Client' not found in /var/www/functions/ec2_instances.php on line 9

Hello,

I think you are using SDK version 1.

Please install second version. You can do this with Composer - http://docs.aws.amazon.com/aws-sdk-php-2/guide/latest/installation.html

I personally prefer to install dependencies with Composer but there other options. For example you can just download the source and setup autoloader. Composer implements autoloading for you so that you don't have to include any AWS class files.

Warm regards,
Victor