think\console\output\driver\Console::doWrite PHP Метод

    protected function doWrite($message, $newline, $stream = null)
    {
        if (null === $stream) {
            $stream = $this->stdout;
        }
        if (false === @fwrite($stream, $message . ($newline ? PHP_EOL : ''))) {
            throw new \RuntimeException('Unable to write output.');
        }
        fflush($stream);
    }