phpCAS::getServerLogoutURL PHP Method

    public static function getServerLogoutURL()
    {
        phpCAS::_validateClientExists();
        return self::$_PHPCAS_CLIENT->getServerLogoutURL();
    }

 /**
  * [Put your description here]
  */
 function main($content, $conf)
 {
     $this->conf = $conf;
     $this->pi_setPiVarDefaults();
     $this->pi_USER_INT_obj = 1;
     // Configuring so caching is not expected. This value means that no cHash params are ever set. We do this, because it's a USER_INT object!
     $this->pi_loadLL();
     $this->typeExecution = "prod";
     $urlCas = "none";
     $portCas = "none";
     if ($this->typeExecution == "dev") {
         $urlCas = "xinf-devlinux.intranet.haras-nationaux.fr";
         $portCas = 7777;
     } else {
         if ($this->typeExecution == "prod") {
             $urlCas = "cerbere.haras-nationaux.fr";
             $portCas = 443;
         }
     }
     session_start();
     if (isset($_GET["action"]) && $_GET["action"] == "disconnect") {
         phpCAS::setDebug();
         phpCAS::client(CAS_VERSION_2_0, $urlCas, $portCas, 'cas', 'true');
         $ur = phpCAS::getServerLogoutURL();
         phpCAS::killSession();
         //Suppression de la sesssion de harasire
         setcookie("netid", "", time() - 3600, "/", ".haras-nationaux.fr");
         //$urCid = "http://www4.haras-nationaux.fr/cid-internet-web/InvalidateSessionServlet?service=".$ur;
         $content .= '<IFRAME src="' . $ur . '" frameborder="no" height="600" width="670"></IFRAME>';
         return $this->pi_wrapInBaseClass($content);
     }
 }