SimpleSAML_Utilities::stringToHex PHP Méthode

    public static function stringToHex($bytes)
    {
        $ret = '';
        for ($i = 0; $i < strlen($bytes); $i++) {
            $ret .= sprintf('%02x', ord($bytes[$i]));
        }
        return $ret;
    }

 protected function __construct()
 {
     /* Call the parent constructor in case it should become
      * necessary in the future.
      */
     parent::__construct();
     /* Initialize the php session handling.
      *
      * If session_id() returns a blank string, then we need
      * to call session start. Otherwise the session is already
      * started, and we should avoid calling session_start().
      */
     if (session_id() === '') {
         $config = SimpleSAML_Configuration::getInstance();
         $cookiepath = $config->getBoolean('session.phpsession.limitedpath', FALSE) ? '/' . $config->getBaseURL() : '/';
         session_set_cookie_params(0, $cookiepath, NULL, SimpleSAML_Utilities::isHTTPS());
         $cookiename = $config->getString('session.phpsession.cookiename', NULL);
         if (!empty($cookiename)) {
             session_name($cookiename);
         }
         $savepath = $config->getString('session.phpsession.savepath', NULL);
         if (!empty($savepath)) {
             session_save_path($savepath);
         }
         if (!array_key_exists(session_name(), $_COOKIE)) {
             /* Session cookie unset - session id not set. Generate new (secure) session id. */
             session_id(SimpleSAML_Utilities::stringToHex(SimpleSAML_Utilities::generateRandomBytes(16)));
         }
         session_start();
     }
 }