Library which contains value objects to represent URI, URL and URNs. The value objects are immutable so in case you change a value through a with* method you get a new instance of that object. There is also a uri resolver class to resolve a uri against a base uri.
<?php
$uri = Uri::parse('/bar?foo=bar');
$uri->getPath(); // /bar
$uri->getQuery(); // foo=bar
$uri->getParameters(); // ['foo' => 'bar']
$uri = $uri->withScheme('https');
$uri = $uri->withScheme('foo.com');
echo $uri->toString(); // https://foo.com/bar?foo=bar
// the url object validates whether a scheme and host is available thus it is a valid url
$url = Url::parse($uri->toString());
// a urn provides additional getter to get the urn specific components. A urn must start with urn:
$urn = Urn::parse('urn:uuid:6e8bc430-9c3a-11d9-9669-0800200c9a66');
$urn->getNid(); // uuid
$urn->getNss(); // 6e8bc430-9c3a-11d9-9669-0800200c9a66