gistfile1.php

<?php

namespace DynamoDbSession;

use Aws\DynamoDb\Session\SessionHandler;
use Silex\Application;
use Silex\ServiceProviderInterface;
use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;

class DynamoDbSessionServiceProvider implements ServiceProviderInterface
{
    public function register(Application $app)
    {
        $app['session.storage'] = $app->share(function ($app) {
            $config = array_merge($app['session.dynamodb.options'], array(
                'dynamodb_client' => $app['aws']->get('dynamodb'),
            ));
            $handler = SessionHandler::factory($config);
            return new NativeSessionStorage($app['session.storage.options'], $handler);
        });

        $app['session.dynamodb.options'] = array();
    }
}