SDK 2.0 after the 1st october

I have some apps using the PHP SDK 2.x. Regarding the Roadmap Migrations planned for the 1st october, I want to know if I have to migrate all my apps to 3.x? Does they will still work on SDK v2.x after t开发者_开发知识库he 1st october? Cheers!

From one of Facebook's announcements:

By October 1, 2011, we require that all website and canvas apps must exclusively support OAuth 2.0 (draft 20). All canvas apps must use the signed_request parameter. This also implies that old, previous versions of our SDKs will stop working, including the old JavaScript SDK.

So, no they won't work, at least if you use any of the features that have changed.