protected function __string($offset)
    {
        $offset += $this->bb->getInt($offset);
        $len = $this->bb->getInt($offset);
        $startPos = $offset + Constants::SIZEOF_INT;
        return substr($this->bb->_buffer, $startPos, $len);
    }
protected function __string($offset)
    {
        $offset += $this->bb->getInt($offset);
        $len = $this->bb->getInt($offset);
        $startPos = $offset + Constants::SIZEOF_INT;
        return substr($this->bb->_buffer, $startPos, $len);
    }
protected function __string ( $ offset ) { $ offset += $ this -> bb -> getInt ( $ offset ) ; $ len = $ this -> bb -> getInt ( $ offset ) ; $ startPos = $ offset + Constants :: SIZEOF_INT ; return substr ( $ this -> bb -> _buffer , $ startPos , $ len ) ; }
fetch utf8 encoded string.

@param $offset
@return string
fetch utf8 encoded string .