How do i check if session_start has been entered?

Question

I have a third party script and was wondering how I can check with PHP if session_start() has been declared before doing something?

Answer 1

I suppose you could use the session_id function :

session_id() returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists).

Or maybe testing whether $_SESSION is set or not, with isset, might do the trick, as it should not be set when no session has been started -- you just have to hope that nothing assigns anything to $_SESSION without starting the session first.