I’ve been using silex for almost 2 years now, I’ve used from unstable to stable version.
All I can say Silex is one of great lightweight PHP frameworks I’ve ever used.
But sad to say, its end of life is set to June 2018 🙁
It’s Ok cause symfony devs offers symfony 4 and they stated it that Symfony 4 and Flex It’s like using Silex and feels as lightweight as using Silex.
Also the current stable version of silex still maintained for bugs and security issues.
So we can still use it 🙂
See full post from Symfony.com posted by Fabien Potencier