'default', 'region' => 'us-west-2', 'version' => '2010-05-08' ]); try { $result = $client->addUserToGroup(array( // GroupName is required 'GroupName' => 'string', // UserName is required 'UserName' => 'string', )); var_dump($result); } catch (AwsException $e) { // output error message if fails error_log($e->getMessage()); } // snippet-end:[iam.php.add_user_to_group.main] // snippet-end:[iam.php.add_user_to_group.complete]