code: public static function init()
      {
          if (self::$isInit === false) {
              if (session_id() == null) {
                  $settings = Config::getSettings();
                  session_name(isset($settings['session_name']) === true ? $settings['session_name'] : 'stray_session');
                  if (isset($settings['session_cookie_domain']) === true) {
                      session_set_cookie_params(0, '/', $settings['session_cookie_domain']);
                  }
                  session_start();
              }
              self::$isInit = true;
          }
      }
docs: Initialize session.
  
  @static