silexphp/Silex — pull request #995 by davtwix (2014-08-07 08:13:58+00:00)
Title: Update session.rst

May be a bug, but Sessions expire after 30 minutes (or less ?)
To have the default behavior describe in documentation, you must set cookie_lifetime to 0

$app->register(new Silex\Provider\UrlGeneratorServiceProvider(), array(
'session.storage.options' => array(
'cookie_lifetime' => 0
)
)
);