How do I check if a session is still active before continuing

[adrianuk29]

How do I go about checking if a session is still active before continuing. If the session is still still active I would like it to tell me.

I tried the following without any luck

if(session_id()){
echo "your session is still active.";
}

all it is giving me is a blank screen even though the session is still active.

any ideas?

Thank you.

[zingbats]

If($_SESSION['Session_name_here']){