Looks very much like Sinatra - http://sinatra.rubyforge.org/ - PHPized.

In Sinatra you don't even need the methods. For example:

  get '/say/*/to/*' do
    # put code here
  end

  post '/somewhere_else' do
    # put code here
  end

If the original developer hasn't seen Sinatra it'd be worth checking out for some ideas - Sinatra is becoming quite popular in Rubyland lately so the ideas are reasonably sticky and probably worth porting to PHP.