title: Best way to completely destroy a session - even if the browser is not closed
body: <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>