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

In PHP versions prior to 5.4, you can just the session_id() function:

$has_session = session_id() !== '';

In PHP version 5.4+, you can use session_status():

$has_session = session_status() == PHP_SESSION_ACTIVE;