Hprose\Socket\Transporter::readHeader PHP Method

    protected function readHeader($stream, $n)
    {
        $header = '';
        do {
            $buffer = @fread($stream, $n - strlen($header));
            $header .= $buffer;
        } while (!empty($buffer) && strlen($header) < $n);
        if (strlen($header) < $n) {
            return false;
        }
        return $header;
    }