Silex - Propel + Session in DB

propel_session_config.php

<?php

use Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler;

use Propel\Runtime\Propel;
use Propel\Runtime\Connection\ConnectionWrapper;
use Propel\Runtime\Connection\PdoConnection;
use Propel\Silex\PropelServiceProvider;

//--------------------------------------
//  Propel + Session in DB.
//  @see 
//		- http://silex.sensiolabs.org/doc/cookbook/session_storage.html
//--------------------------------------
$app->register(new PropelServiceProvider(),[
	'propel.config_file' => __DIR__ . '/config/propel.php'
]);

$app->register(new SessionServiceProvider());
$app['session.storage.handler'] = $app->share(function () {
	
	$name = Propel::getDefaultDatasource();
	$configuration = 
		Propel::getServiceContainer()
			->getConnectionManager($name)
			->getConfiguration();
	
	$pdo = new PdoConnection($configuration['dsn'], $configuration['user'],
		$configuration['password']);
	$con = new ConnectionWrapper($pdo);
	return new PdoSessionHandler($con->getWrappedConnection());
});