MessagePack\BufferUnpacker::unpackFloat64 PHP Method

    private function unpackFloat64()
    {
        if (!isset($this->buffer[$this->offset + 7])) {
            throw new InsufficientDataException(8, \strlen($this->buffer) - $this->offset);
        }
        $num = \substr($this->buffer, $this->offset, 8);
        $this->offset += 8;
        $num = \unpack('d', \strrev($num));
        return $num[1];
    }