session_id() equivalent?

[eluser]Arun Joshi[/eluser]
Whats the session_id() equivalent in CI?

When I tried session_id() is blank. I have not started session_start(). Is that the reason? Is there any way to get the current session id using CI?

[eluser]danmontgomery[/eluser]
This question is answered in the user guide.