function feed2array($feed)
  {
    $feed_content = implode("", file($feed));
    $_feed = array();
    $_feed['url'] = $feed;
    $_feed['channel'] = array();
    $_feed['items'] = array();
    preg_match_all("/\<channel.*?\>.*?\<title\>(.*?)\<\/title\>.*?\<\/channel\>/si", $feed_content, $_channel_title, PREG_PATTERN_ORDER);
    preg_match_all("/\<channel.*?\>.*?\<link\>(.*?)\<\/link\>.*?\<\/channel\>/si", $feed_content, $_channel_link, PREG_PATTERN_ORDER);
    preg_match_all("/\<channel.*?\>.*?\<description\>(.*?)\<\/description\>.*?\<\/channel\>/si", $feed_content, $_channel_descr, PREG_PATTERN_ORDER);
    $_feed['channel']['title'] = $_channel_title[1][0];
    $_feed['channel']['link'] = $_channel_link[1][0];
    $_feed['channel']['description'] = $_channel_descr[1][0];
    preg_match_all("/\<item.*?\>.*?\<title\>(.*?)\<\/title\>.*?\<\/item\>/si", $feed_content, $_items_titles, PREG_PATTERN_ORDER);
    preg_match_all("/\<item.*?\>.*?\<link\>(.*?)\<\/link\>.*?\<\/item\>/si", $feed_content, $_items_links, PREG_PATTERN_ORDER);
    preg_match_all("/\<item.*?\>.*?\<description\>(.*?)\<\/description\>.*?\<\/item\>/si", $feed_content, $_items_descrs, PREG_PATTERN_ORDER);
    foreach($_items_titles[1] as $key => $title)
      {
        $_feed['items'][$key] = array();
        $_feed['items'][$key]['title'] = $title;
        $_feed['items'][$key]['link'] = $_items_links[1][$key];
        $_feed['items'][$key]['description'] = $_items_descrs[1][$key];
      }
    return $_feed;
  }

$_feed = feed2array("http://www.heise.de/newsticker/heise.rdf");
echo "<pre>";
print_r($_feed);
echo "</pre><hr>";

$_feed = feed2array("http://www.php.net/news.rss");
echo "<pre>";
print_r($_feed);
echo "</pre><hr>";