了解Slim框架基础知识

I recently used the Slim framework to create an API. I want to have things clear to me.

1. What exactly is the Slim object?
2. What exactly makes $app->run() call the routing or the methods?
3. Is the RESTful interface itself handled by the Slim() object $app?

Thank you in advance.

The creator of the Slim Framework (Josh Lockhart) has a blog on the subject where he briefly explains some of the points you mention:

Calendar with slim

I personally learn by doing. There's a channel called, phpacademy on youtube where Alex and Co. have some great tutorials.

Blog

Authentication system