phpCAS::setDebug PHP Méthode

    public static function setDebug($filename = '')
    {
        if ($filename != false && gettype($filename) != 'string') {
            phpCAS::error('type mismatched for parameter $dbg (should be false or the name of the log file)');
        }
        if ($filename === false) {
            self::$_PHPCAS_DEBUG['filename'] = false;
        } else {
            if (empty($filename)) {
                if (preg_match('/^Win.*/', getenv('OS'))) {
                    if (isset($_ENV['TMP'])) {
                        $debugDir = $_ENV['TMP'] . '/';
                    } else {
                        $debugDir = '';
                    }
                } else {
                    $debugDir = DEFAULT_DEBUG_DIR;
                }
                $filename = $debugDir . 'phpCAS.log';
            }
            if (empty(self::$_PHPCAS_DEBUG['unique_id'])) {
                self::$_PHPCAS_DEBUG['unique_id'] = substr(strtoupper(md5(uniqid(''))), 0, 4);
            }
            self::$_PHPCAS_DEBUG['filename'] = $filename;
            self::$_PHPCAS_DEBUG['indent'] = 0;
            phpCAS::trace('START (' . date("Y-m-d H:i:s") . ') phpCAS-' . PHPCAS_VERSION . ' ******************');
        }
    }

 public static function initialized_php_cas()
 {
     if (!self::$_initialized_php_cas) {
         $casVersion = OCP\Config::getAppValue('user_cas', 'cas_server_version', '2.0');
         $casHostname = OCP\Config::getAppValue('user_cas', 'cas_server_hostname', $_SERVER['SERVER_NAME']);
         $casPort = OCP\Config::getAppValue('user_cas', 'cas_server_port', 443);
         $casPath = OCP\Config::getAppValue('user_cas', 'cas_server_path', '/cas');
         $casDebugFile = OCP\Config::getAppValue('user_cas', 'cas_debug_file', '');
         $casCertPath = OCP\Config::getAppValue('user_cas', 'cas_cert_path', '');
         $php_cas_path = OCP\Config::getAppValue('user_cas', 'cas_php_cas_path', 'CAS.php');
         if (!class_exists('phpCAS')) {
             if (empty($php_cas_path)) {
                 $php_cas_path = 'CAS.php';
             }
             OC_Log::write('cas', "Try to load phpCAS library ({$php_cas_path})", OC_Log::DEBUG);
             include_once $php_cas_path;
             if (!class_exists('phpCAS')) {
                 OC_Log::write('cas', 'Fail to load phpCAS library !', OC_Log::ERROR);
                 return false;
             }
         }
         if ($casDebugFile !== '') {
             phpCAS::setDebug($casDebugFile);
         }
         phpCAS::client($casVersion, $casHostname, (int) $casPort, $casPath, false);
         if (!empty($casCertPath)) {
             phpCAS::setCasServerCACert($casCertPath);
         } else {
             phpCAS::setNoCasServerValidation();
         }
         self::$_initialized_php_cas = true;
     }
     return self::$_initialized_php_cas;
 }