How can you check if a PHP session exists?

Question

Just wondering how to check if a PHP session exists... My understanding is that no matter what, if I am using sessions, I have to start my files with session_start() to even acc

Answer 1

I've always simply used

if (@session_id() == "") @session_start();

Hasn't failed me yet.

Been quite a long time using this.

NOTE: @ simply suppresses warnings.