Kafka\Socket::read PHP Method

    public function read($len, $verifyExactLength = false)
    {
        if ($len > self::READ_MAX_LEN) {
            throw new \Kafka\Exception\SocketEOF('Could not read ' . $len . ' bytes from stream, length too longer.');
        }
        $null = null;
        $read = array($this->stream);
        $readable = @stream_select($read, $null, $null, $this->recvTimeoutSec, $this->recvTimeoutUsec);
        if ($readable > 0) {
            $remainingBytes = $len;
            $data = $chunk = '';
            while ($remainingBytes > 0) {
                $chunk = fread($this->stream, $remainingBytes);
                if ($chunk === false) {
                    $this->close();
                    throw new \Kafka\Exception\SocketEOF('Could not read ' . $len . ' bytes from stream (no data)');
                }
                if (strlen($chunk) === 0) {
                    // Zero bytes because of EOF?
                    if (feof($this->stream)) {
                        $this->close();
                        throw new \Kafka\Exception\SocketEOF('Unexpected EOF while reading ' . $len . ' bytes from stream (no data)');
                    }
                    // Otherwise wait for bytes
                    $readable = @stream_select($read, $null, $null, $this->recvTimeoutSec, $this->recvTimeoutUsec);
                    if ($readable !== 1) {
                        throw new \Kafka\Exception\SocketTimeout('Timed out reading socket while reading ' . $len . ' bytes with ' . $remainingBytes . ' bytes to go');
                    }
                    continue;
                    // attempt another read
                }
                $data .= $chunk;
                $remainingBytes -= strlen($chunk);
            }
            if ($len === $remainingBytes || $verifyExactLength && $len !== strlen($data)) {
                // couldn't read anything at all OR reached EOF sooner than expected
                $this->close();
                throw new \Kafka\Exception\SocketEOF('Read ' . strlen($data) . ' bytes instead of the requested ' . $len . ' bytes');
            }
            return $data;
        }
        if (false !== $readable) {
            $res = stream_get_meta_data($this->stream);
            if (!empty($res['timed_out'])) {
                $this->close();
                throw new \Kafka\Exception\SocketTimeout('Timed out reading ' . $len . ' bytes from stream');
            }
        }
        $this->close();
        throw new \Kafka\Exception\SocketEOF('Could not read ' . $len . ' bytes from stream (not readable)');
    }

 /**
  * Read the response error code
  *
  * @return integer Error code
  */
 protected function getResponseCode()
 {
     $this->connect();
     $data = $this->socket->read(2, true);
     $unpack = unpack('n', $data);
     return array_shift($unpack);
 }