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?

something like if(isset($_session_start())) { //do something }

Answer 1

if(isset($_SESSION)) {
    // do something
}

Answer 2

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.

Answer 3

function session_started(){ return !!session_id(); }