use Obsidian\ETF\Decoder;

// the binary erlang term format string (#PID<0.81.0>)
$binary = base64_decode("g2d3DW5vbm9kZUBub2hvc3QAAABRAAAAAAA=");

$etf = new Decoder();
$pid = $etf->decode($binary);

var_dump($pid);

/*
class Obsidian\ETF\PID#6 (4) {
    public $node =>
    class Obsidian\ETF\Atom#5 (1) {
        public $atom =>
        string(13) "nonode@nohost"
    }
    public $id =>
    int(81)
    public $serial =>
    int(0)
    public $creation =>
    int(0)
}
*/

use Obsidian\ETF\Atom;
use Obsidian\ETF\Encoder;

$value = new Atom('hello');

$etf = new Encoder();
$binary = $etf->encode($value);

var_dump($binary);

/*
string(8) "w║hello"
*/