This build pack is used to bundle Symfony2-based webapps and PHP-FPM+Nginx server for Heroku apps.
This buildpack will add a few environment variables at compile time by parsing DATABASE_URL:
HEROKU_DATABASE_USERHEROKU_DATABASE_PASSWORDHEROKU_DATABASE_HOSTHEROKU_DATABASE_DBHEROKU_DATABASE_PORT
It also sets HEROKU_ASSETS_VERSION based on the date to have it during the slug compilation.
This build pack is strongly coupled & linked to our own app.
A new build pack for Symfony2 will be rewritten soon by our team. It will be more efficient and less coupled to our app configuration. You can find it here : https://github.com/Swop/heroku-buildpack-symfony2