Session already started - how to check?

[suro]

Hi
Is there a way to check whether the session has already been started?
I get the notice errors when I call the session_start() for more than one time (can't avoid this)

Thanks.

[n0other]

Use if (!session_id()) { // There is no session } to test. Though comments at php.net says you should use if (session_id() == '') to check this, but a quick test gave the same results. (PHP5)

[suro]

if(!session_id()) works but if(session_id() == '') gives header errors which is obvious (in my code).
Thanks.