Best way to completely destroy a session - even if the browser is not closed
<p>Is it enough to </p>

<pre><code>session_start();   //  Must start a session before destroying it

if (isset($_SESSION))
{
    unset($_SESSION);
    session_unset();
    session_destroy();
}
</code></pre>

<p>when the user selects <code>Log out</code> from a menu, but does not quit his browser?  I want to totally remove all existence of the session and <code>$_SESSION</code></p>
