Kafka\Protocol\Fetch\MessageSet::loadNextMessage PHP Method

    public function loadNextMessage()
    {
        if ($this->validByteCount >= $this->messageSetSize) {
            return false;
        }
        try {
            if ($this->validByteCount + 12 > $this->messageSetSize) {
                // read socket buffer dirty data
                $this->stream->read($this->messageSetSize - $this->validByteCount);
                return false;
            }
            $offset = $this->stream->read(8, true);
            $this->offset = \Kafka\Protocol\Decoder::unpack(Decoder::BIT_B64, $offset);
            $messageSize = $this->stream->read(4, true);
            $messageSize = Decoder::unpack(Decoder::BIT_B32, $messageSize);
            $messageSize = array_shift($messageSize);
            $this->validByteCount += 12;
            if ($this->validByteCount + $messageSize > $this->messageSetSize) {
                // read socket buffer dirty data
                $this->stream->read($this->messageSetSize - $this->validByteCount);
                return false;
            }
            $msg = $this->stream->read($messageSize, true);
            $this->current = new Message($msg);
        } catch (\Kafka\Exception $e) {
            \Kafka\Log::log("already fetch: {$this->validByteCount}, {$e->getMessage()}", LOG_INFO);
            return false;
        }
        $this->validByteCount += $messageSize;
        return true;
    }