I've been working with Silex a few times now. And I like it, but sometimes, the documentation confuses me simply because they use another folder structure.
Who can tell me which folder structure they use exactly in Silex 2.0? Documentation
├── composer.json
├── composer.lock
├── vendor
│ └── ...
└── web
└── index.php
Where are the views, controllers etcetera stored?
Silex is not a "convention over configuration" framework: it does not prescribe nor care what the structure of your file system or application organisation is; that is why there's no mention of such things in the docs.
Just organise things the way that best suits your own needs.