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

Here's a good drop in replacement that won't break stuff when you move to 5.4:

if(!function_exists('session_status')){
    function session_active(){
        return defined('SID');   
    }
}else{
    function session_active(){
        return (session_status() == PHP_SESSION_ACTIVE);   
    }        
}