There's nothing Django or PHP-specific about setting this up. However,
if you've configured your Django installation to control everything
under "/", then you'll need to make sure it also responds to request for
favico.
An even easier solution is simply to put the favicon file wherever you
serve other static data from (e.g. where your stylesheets and images
are) and put a <link rel="icon"...> line in your base template to point
clients to the right location.
Regards,
Malcolm