Using SetEnv in Apache : where and how can I do that?

[qazar]

I want to run locally an App I am developing. There are instructions about how to config that here : http://devcenter.heroku.com/articles/facebook#working_locally in 2).I am using PHP, so I will use Apache. I had already runned a PHP project thanks to WampServer, but I do not know and do not understand how it works really.Now I want to use SetEnv to set the env vars for my local app