Web Linking support in PEAR

PEAR's HTTP2 package got Web Linking (RFC 5988) support in version 1.1.0.

Parsing HTTP Link: header values is now easy:

<?php
require_once 'HTTP2.php';
 
//Link headers that we got from somewhere, e.g.
// HTTP_Request2_Response::getHeader('link')
$link = '<http://pear.php.net/webmention.php>; rel="webmention"';
 
$http = new HTTP2();
$links = $http->parseLinks($link);
var_dump($links);
?>

It will give you the following output:

array(1) {
  [0] => array(2) {
    '_uri' => string(34) "http://pear.php.net/webmention.php"
    'rel' => array(1) {
      [0] => string(10) "webmention"
    }
  }
}

HTTP link headers are used to express relations of the resource to other URIs, e.g. copyright info or prev/next links of a paged result.

Apart from the URI, link headers may contain a number of attributes (parameters) . Here are some of them:

rel: Relation of the URI to the current resource, e.g. "copyright", "index", "next" or "stylesheet". See the list of registered relations .
type: MIME type of the URI. Can be used to link to alternate formats of the current resource.
title: Human readable title of the link

I implemented the HTTP2::parseLinks() method because web linking is used by WebMention to detect the URL of the linkback server.

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Web Linking support in PEAR