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<?php

require_once("arc/ARC2.php"); // http://arc.semsol.org/

$url = 'http://www.google.com/';  // URL to investigate

$ns_rss = 'http://purl.org/rss/1.0/';
$ns_dc = 'http://purl.org/dc/elements/1.1/';
$ns_rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';

$md5_url = md5($url);
$rss_url = 'http://del.icio.us/rss/url/' . $md5_url;
$html_url = 'http://del.icio.us/url/' . $md5_url;

$rdf = file_get_contents($rss_url);

$parser = ARC2::getRDFXMLParser();
$parser->parse($rss_url, $rdf);
$root = $parser->getSimpleIndex();

$channel = $root["$html_url"];
$items_id = $channel[$ns_rss . 'items'][0];
$items = $root["$items_id"];

$output = array();
foreach ($items as $key => $triple){
  $item = $root["$triple[0]"]; // pick out the individual item by ID
  
  if ($item[$ns_rdf . 'type'][0] == $ns_rss . 'item'){ // if it's an "rss item"
    $output[] = array(
      'creator' => $item[$ns_dc . 'creator'][0],
      'tags' => $item[$ns_dc . 'subject'][0],
      'description' => $item[$ns_rss . 'description'][0],
      );
  }
}
print_r($output);