MessagePack\Packer::packMap PHP Method

    public function packMap(array $map)
    {
        $size = \count($map);
        $data = self::packMapHeader($size);
        foreach ($map as $key => $val) {
            $data .= $this->pack($key);
            $data .= $this->pack($val);
        }
        return $data;
    }