How to tell if a session is active?

Question

Per request, there are a few different ways that you can tell whether or not a session has been started, such as:

$isSessionActive = (session_id() != \"\");
         


        

Answer 1

See edits to the original question; basically, PHP 5.4 and above now has a function called session_status() to solve this problem!

"Expose session status via new function, session_status" (SVN Revision 315745)

If you need this functionality in a pre-PHP 5.4 version, see hakre's answer.