Send a cookie with a file_get_contents( ) request?

I have a web site where I use cookies to store logins, and also session cookies for users logged in. Is there a way for me to use file_get_contents() to pull content which are "behind" the login? In other words, I want to use my own log-in cookie and somehow send it with the file_get_contents request to get the content. Can I somehow do this? Or are there other ways? Anders.