Deployment\FtpServer::writeFile PHP Method

    public function writeFile($local, $remote, callable $progress = NULL)
    {
        $size = max(filesize($local), 1);
        $retry = self::RETRIES;
        upload:
        $blocks = 0;
        do {
            if ($progress) {
                $progress(min($blocks * self::BLOCK_SIZE / $size, 100));
            }
            try {
                $ret = $blocks === 0 ? $this->ftp('nb_put', $remote, $local, FTP_BINARY) : $this->ftp('nb_continue');
            } catch (FtpException $e) {
                @ftp_close($this->connection);
                // intentionally @
                $this->connect();
                if (--$retry) {
                    goto upload;
                }
                throw new FtpException("Cannot upload file {$local}, number of retries exceeded. Error: {$e->getMessage()}");
            }
            $blocks++;
        } while ($ret === FTP_MOREDATA);
        if ($progress) {
            $progress(100);
        }
    }