MessagePack\BufferUnpacker::unpackInt32 PHP Method

    private function unpackInt32()
    {
        if (!isset($this->buffer[$this->offset + 3])) {
            throw new InsufficientDataException(4, \strlen($this->buffer) - $this->offset);
        }
        $num = \substr($this->buffer, $this->offset, 4);
        $this->offset += 4;
        $num = \unpack('i', \strrev($num));
        return $num[1];
    }