On the LeaseWeb Labs blog there's a continuation from a previous post about migrating your Symfony1 application over to Symfony2. In the first part of this series of posts, Stefan Koopmanschap talked about wrapping your code to make it work. In this second post, Maurtis van der Schee tackles two issues Stefan mentioned - performance problems and handling authorization/authentication.

On December 21, 2011 Stefan Koopmanschap wrote an excellent article on this blog titled "Painless (well, less painful) migration to Symfony2." [...] We were very much inspired by his passionate elucidation and we were fully convinced of the urge to start migrating to Symfony2 as soon as possible. However, he also provided us with a "A word of caution" about 2 things: performance and authentication/authorization. This might get some people worried, but not us: it challenged us to find a solution for those two open issues.

They explain why these two things are a problem and some of their solutions they've created - a .htaccess for routing and manually replicating the Symfony2 session in the Symfony1 code. Included in the post are the rewrite rules and code to make these two things happen (and a small configuration change to make them work).