Warning: session_destroy(): Trying to destroy uninitialized session

Question

my class.inc file:

<?php
class logout{
    public function logout(){
        $_SESSION = array();
        if (ini_get("session.use_cookies")) {
            $params = session_get_cookie_params();
            setcookie(session_name(), '', time() - 42000, $params['path'], $params['domain'], $params['secure'], $params["httponly"]);
        }
        session_destroy();
    }   
}

?>

used code for my logout:

session_start();
require($path."include/class.inc");
if(!empty($_GET['logout'])){
    $object=new logout();
    $object->logout();
    $content='5;url='.$path.'index.php';
}

When the logout function is called, it destroys the session, but shows the warning:

Warning: session_destroy(): Trying to destroy uninitialized session in class.inc on line 9

I am unable to troubleshoot, as the session is not being destroyed by any other means before the session_destroy() of class.inc.

Answer 1

You have to call the function mentioned below at the top your logout function in the logout class.

session_start();

Add the above function and try it out. If you don’t start the session at the top of your file, it will throw exceptions like “headers already sent”, “can’t start the session”, etc.

Answer 2

This error is common when you haven't started the session beforehand

if (!isset($_SESSION))
  {
    session_start();
  }