Silex is hardly a "micro framework", it's basically Symfony without the configuration files. So it's a LOT of code. I like it by the way, always hated the Spring like insanity of Symfony, but let's not pretend Silex + all Symfony libs the framework has to import are small.
The irony is that for this very project, Both Silex and Symfony\Process are completely redundant, especially with PHP bloated core APIs.
