public function putFromString($remote_file, $content)
    {
        $handle = fopen('php://temp', 'w');

        fwrite($handle, $content);
        rewind($handle);

        if ($this->ftp->fput($remote_file, $handle, FTP_BINARY)) {
            return $this;
        }

        throw new FtpException('Unable to put the file "'.$remote_file.'"');
    }