[PHP] Output graphic or other download file to client's browser

[Jason Lam]

Hello!

I am trying to develop a web site where some files and images are private, I am using 
session to auth. user. 

I would like to know how I can send some local files to the client so that others 
without the access to the web site will not be able to download. 

How would I stream the local image (jpg) files over to client? I know how to stream it 
the normal way, just don't know how I can stream it to some and not others.

Anyone have suggestions on this one?

Jason Lam