How to integrate Symfony session into independent PHP application

  composer-php, session, symfony

I have written a standalone PHP-based application and added Symfony packages via Composer. However, I haven’t used Symfony before and can’t seem to figure from the symfony docs how to integrate session creation and handling in my index.php (side note: I want to use several other packages of it too). I’m kinda lost and don’t know how to start. Which further steps are to take? Can you point me with an easy startup example?

Source: Symfony Questions