/**
  * Session storage
  *
  * @since  1.1.0
  * @internal
  */
 private static function _sess_init()
 {
     if (null !== self::$_have_session) {
         return;
     }
     self::$_have_session = false;
     if (!session_id()) {
         if (!headers_sent()) {
             session_start();
             self::$_have_session = true;
         }
     } else {
         self::$_have_session = true;
     }
 }