code: public function mkdir($path, $mode, $options = 0)
      {
          self::restorePrev();
          $success = \mkdir($path, $mode, (bool) ($options & STREAM_MKDIR_RECURSIVE));
          self::register();
          return $success;
      }
docs: Create a directory
  
  @param string  $path    Directory which should be created.
  @param integer $mode    The value passed to mkdir().
  @param integer $options A bitwise mask of values, such as STREAM_MKDIR_RECURSIVE.
  
  @return boolean