Why is PHP session_destroy() not working?

I tried to destroy all session variable by using the session_destroy() method, but after using this method, the values are not destroyed.

Why is session_destroy() not working?

Is there any other way to destroy the session in PHP?

if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1800)) 
{   
    session_destroy();   
    session_unset();     
}

Answer

After using session_destroy(), the session is destroyed behind the scenes. For some reason this doesn’t affect the values in $_SESSION, which was already populated for this request, but it will be empty in future requests.

You can manually clear $_SESSION if you so desire ($_SESSION = [];).