www Problem

Hallo,
ich habe ein Problem mit meinem Feed und würde mich über Hilfe sehr freuen.
Hier erst mal die Feed Adresse:
RSS Feed Pool Forum und Sauna Forum

Auf diesem Feed werden all Links mit www angezeigt.
Wie kann ich den Feed verändern, dass alle Links ohne www angezeigt werden?
Hier der Inhalt der Feed Datei:

l

Code:

<?php

define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
include($phpbb_root_path . 'language/en/common.' . $phpEx);

// Start session
$user->session_begin();
$auth->acl($user->data);
$user->setup();

//Get the board url address
$board_url = generate_board_url();

function replace_xml_things($text)
{
global $board_url;
$text = str_replace('&pound', '&#163;', $text);
$text = str_replace('©', '(c)', $text);
$text = str_replace('&', '&', $text);
$text = str_replace('./images/', $board_url . '/images/', $text);
return $text;
}

function make_xml_compatible($text,$bbcode_uid, $bbcode_bitfield,$bbcode_options)
{
global $config, $base_url;
$text = html_entity_decode(generate_text_for_display($text, $bbcode_uid, $bbcode_bitfield, $bbcode_options));
$text = nl2br($text);
$text = replace_xml_things($text);
$text = htmlspecialchars($text);
return $text;
}

// Start RSS output
header('Content-Type: text/xml; charset=utf-8');
$rss_result = '<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
<channel>
<title>' . $config['sitename'] . '</title>
<link>' . $board_url . '</link>
<description>' . $config['site_desc'] . '</description>
<language>' . $config['default_lang'] . '</language>
<copyright>' . $config['sitename'] . '</copyright>
<managingEditor>' . $config['board_email'] . ' (' . $config['sitename'] . ')</managingEditor>
<generator>' . $config['sitename'] . '</generator>
<ttl>1</ttl>';
//
// This SQL query selects the latest topics of all forum
$sql = 'SELECT f.forum_id,f.forum_name, f.forum_desc_options, t.topic_title, t.topic_id,t.topic_last_post_id,t.topic_last_poster_name, p.post_time, p.post_text, p.bbcode_uid, p.bbcode_bitfield, u.username, u.user_id
FROM '. FORUMS_TABLE . ' f,' . TOPICS_TABLE . ' t, ' . POSTS_TABLE . ' p,' . USERS_TABLE . ' u
WHERE t.forum_id = f.forum_id
AND t.topic_status != 1
AND p.post_id = t.topic_last_post_id
AND u.user_id = p.poster_id
ORDER BY t.topic_last_post_id DESC';
if(!$result = $db->sql_query_limit($sql,30))
{
trigger_error('Database error, please try later');
}
while($row = $db->sql_fetchrow($result))
{
if($auth->acl_get('f_read', $row['forum_id'])) //getting authentication
{
$topic_link = $board_url . '/' . generate_seourl_topic($row['topic_id'], $row['topic_title'], $row['forum_id'], $row['forum_name']);
$topic_link = str_replace('./', '/', $topic_link);
$description = $user->lang['POST_BY_AUTHOR'] . ' ' . $row['topic_last_poster_name'] . ' (' . $user->lang['POSTED'] . ' ' . $user->format_date($row['post_time']) . ')<br />' . $row['post_text'] . '<br /><br /><a href="' . $topic_link . '">Thema lesen</a><hr />';
$rss_result .= '
<item>
<title>' . replace_xml_things($row['topic_title']) . '</title>
<link>' . $topic_link . '</link>
<description>' . make_xml_compatible($description, $row['bbcode_uid'], $row['bbcode_bitfield'], $row['forum_desc_options']) . '</description>

<pubDate>' . date ('D, d M Y h:i:s', $row['post_time']) . ' GMT</pubDate>
<guid isPermaLink="true">' . $topic_link . '</guid>
</item>';
}
}
$rss_result .= '</channel></rss>';
echo $rss_result;
$db->sql_freeresult($result);
?>

Grüsse