... PHP 4 >= 4.0.0) session_name -- Get and/or set the current session name . ... session_name() returns the name of the current session. ... The session name is reset to the default value stored in session.name at request startup time. Thus, you need to call session_name() for every request (and before session_start() or session_register() are called). ... php // set the session name to WebsiteID $previous_name = session_name("WebsiteID"); echo "The previous session name was $previous_name<p>"; ?> ...