I've been working with punBB on my own private system to learn it and modify it into what I want. However something went wrong in the long modification process in viewforum.php; whenever I try to view a forum it gives me a page consisting of this:
Will someone with a working copy of 1.2.15 with 1.0.9.2 of the subforum mod be so kind as to do a diff with my viewforum.php and help me find what's wrong? As far as I can tell this is the only location that is currently having trouble. 
Update: I have tried taking a vanilla copy of the 1.2.15 viewtopic.php file and modifying it over again, but the error persists. It seems the 1.0.9.2 release of Sub Forum doesn't like the latest PunBB release. 
<?php
/***********************************************************************
Copyright (C) 2002-2005 Rickard Andersson (rickard@punbb.org)
This file is part of PunBB.
PunBB is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
PunBB is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
************************************************************************/
define('PUN_ROOT', './');
require PUN_ROOT.'include/common.php';
if ($pun_user['g_read_board'] == '0')
message($lang_common['No view']);
$id = isset($_GET['id']) ? intval($_GET['id']) : 0;
if ($id < 1)
message($lang_common['Bad request']);
// Load the viewforum.php language file
require PUN_ROOT.'lang/'.$pun_user['language'].'/forum.php';
require PUN_ROOT.'lang/'.$pun_user['language'].'/index.php';
// Fetch some info about the forum
$result = $db->query('SELECT f.forum_name, pf.forum_name AS parent_forum, f.redirect_url, f.moderators, f.num_topics, f.sort_by, f.parent_forum_id, fp.post_topics FROM '.$db->prefix.'forums AS f LEFT JOIN '.$db->prefix.'forum_perms AS fp ON (fp.forum_id=f.id AND fp.group_id='.$pun_user['g_id'].') LEFT JOIN '.$db->prefix.'forums AS pf ON f.parent_forum_id=pf.id WHERE (fp.read_forum IS NULL OR fp.read_forum=1) AND f.id='.$id) or error('Unable to fetch forum info', __FILE__, __LINE__, $db->error());
if (!$db->num_rows($result))
message($lang_common['Bad request']);
$cur_forum = $db->fetch_assoc($result);
// Is this a redirect forum? In that case, redirect!
if ($cur_forum['redirect_url'] != '')
{
header('Location: '.$cur_forum['redirect_url']);
exit;
}
// Sort out who the moderators are and if we are currently a moderator (or an admin)
$mods_array = array();
if ($cur_forum['moderators'] != '')
$mods_array = unserialize($cur_forum['moderators']);
$is_admmod = ($pun_user['g_id'] == PUN_ADMIN || ($pun_user['g_id'] == PUN_MOD && array_key_exists($pun_user['username'], $mods_array))) ? true : false;
// Can we or can we not post new topics?
if (($cur_forum['post_topics'] == '' && $pun_user['g_post_topics'] == '1') || $cur_forum['post_topics'] == '1' || $is_admmod)
$post_link = "\t\t".'<p class="postlink conr"><a href="post.php?fid='.$id.'">'.$lang_forum['Post topic'].'</a></p>'."\n";
else
$post_link = '';
// Determine the topic offset (based on $_GET['p'])
$num_pages = ceil($cur_forum['num_topics'] / $pun_user['disp_topics']);
$p = (!isset($_GET['p']) || $_GET['p'] <= 1 || $_GET['p'] > $num_pages) ? 1 : $_GET['p'];
$start_from = $pun_user['disp_topics'] * ($p - 1);
// Generate paging links
$paging_links = $lang_common['Pages'].': '.paginate($num_pages, $p, 'viewforum.php?id='.$id);
$page_title = pun_htmlspecialchars($pun_config['o_board_title'].' / '.$cur_forum['forum_name']);
define('PUN_ALLOW_INDEX', 1);
require PUN_ROOT.'header.php';
$subforum_result = $db->query('SELECT forum_desc, forum_name, id, last_post, last_post_id, last_poster, moderators, num_posts, num_topics, redirect_url FROM '.$db->prefix.'forums WHERE parent_forum_id='.$id.' ORDER BY disp_position') or error('Unable to fetch sub forum info',__FILE__,__LINE__,$db->error());
if($db->num_rows($subforum_result))
{
?>
<div class="linkst">
<div class="inbox">
<ul><li><a href="index.php"><?php echo $lang_common['Index'] ?></a> </li><li>» <?php echo pun_htmlspecialchars($cur_forum['forum_name']) ?></li></ul>
<div class="clearer"></div>
</div>
</div>
<div id="vf" class="blocktable">
<h2><span>Sub forums</span></h2>
<div class="box">
<div class="inbox">
<table cellspacing="0">
<thead>
<tr>
<th class="tcl" scope="col"><?php echo $lang_common['Forum'] ?></th>
<th class="tc2" scope="col"><?php echo $lang_index['Topics'] ?></th>
<th class="tc3" scope="col"><?php echo $lang_common['Posts'] ?></th>
<th class="tcr" scope="col"><?php echo $lang_common['Last post'] ?></th>
</tr>
</thead>
<tbody>
<?php
while($cur_subforum = $db->fetch_assoc($subforum_result))
{
$item_status = '';
$icon_text = $lang_common['Normal icon'];
$icon_type = 'icon';
// Are there new posts?
if (!$pun_user['is_guest'] && $cur_subforum['last_post'] > $pun_user['last_visit'])
{
$item_status = 'inew';
$icon_text = $lang_common['New icon'];
$icon_type = 'icon inew';
}
// Is this a redirect forum?
if ($cur_forum['redirect_url'] != '')
{
$forum_field = '<h3><a href="'.pun_htmlspecialchars($cur_subforum['redirect_url']).'" title="'.$lang_index['Link to'].' '.pun_htmlspecialchars($cur_subforum['redirect_url']).'">'.pun_htmlspecialchars($cur_subforum['forum_name']).'</a></h3>';
$num_topics = $num_posts = ' ';
$item_status = 'iredirect';
$icon_text = $lang_common['Redirect icon'];
$icon_type = 'icon';
}
else
{
$forum_field = '<h3><a href="viewforum.php?id='.$cur_subforum['id'].'">'.pun_htmlspecialchars($cur_subforum['forum_name']).'</a></h3>';
$num_topics = $cur_subforum['num_topics'];
$num_posts = $cur_subforum['num_posts'];
}
if ($cur_subforum['forum_desc'] != '')
$forum_field .= "\n\t\t\t\t\t\t\t\t".$cur_subforum['forum_desc'];
// If there is a last_post/last_poster.
if ($cur_subforum['last_post'] != '')
$last_post = '<a href="viewtopic.php?pid='.$cur_subforum['last_post_id'].'#p'.$cur_subforum['last_post_id'].'">'.format_time($cur_subforum['last_post']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_subforum['last_poster']).'</span>';
else
$last_post = ' ';
if ($cur_subforum['moderators'] != '')
{
$mods_array = unserialize($cur_subforum['moderators']);
$moderators = array();
while (list($mod_username, $mod_id) = @each($mods_array))
$moderators[] = '<a href="profile.php?id='.$mod_id.'">'.pun_htmlspecialchars($mod_username).'</a>';
$moderators = "\t\t\t\t\t\t\t\t".'<p><em>('.$lang_common['Moderated by'].'</em> '.implode(', ', $moderators).')</p>'."\n";
}
?>
<tr<?php if ($item_status != '') echo ' class="'.$item_status.'"'; ?>>
<td class="tcl">
<div class="intd">
<div class="<?php echo $icon_type ?>"><div class="nosize"><?php echo $icon_text ?></div></div>
<div class="tclcon">
<?php echo $forum_field;
if ($cur_subforum['moderators'] != '') {
echo "\n".$moderators;
}
?>
</div>
</div>
</td>
<td class="tc2"><?php echo $num_topics ?></td>
<td class="tc3"><?php echo $num_posts ?></td>
<td class="tcr"><?php echo $last_post ?></td>
</tr>
<?php
}
?>
</tbody>
</table>
</div>
</div>
</div>
<?php
}
?>
<div class="linkst">
<div class="inbox">
<p class="pagelink conl"><?php echo $paging_links ?></p>
<?php
echo $post_link;
if($cur_forum['parent_forum'])
echo "\t\t".'<ul><li><a href="index.php">'.$lang_common['Index'].'</a> </li><li>» <a href="viewforum.php?id='.$cur_forum['parent_forum_id'].'">'.pun_htmlspecialchars($cur_forum['parent_forum']).'</a> </li><li>» '.pun_htmlspecialchars($cur_forum['forum_name']).'</li></ul>';
else
echo "\t\t".'<ul><li><a href="index.php">'.$lang_common['Index'].' </a> </li><li>» '.pun_htmlspecialchars($cur_forum['forum_name']).'</li></ul>';
?>
<div class="clearer"></div>
</div>
</div>
<div id="vf" class="blocktable">
<h2><span><?php echo pun_htmlspecialchars($cur_forum['forum_name']) ?></span></h2>
<div class="box">
<div class="inbox">
<table cellspacing="0">
<thead>
<tr>
<th class="tcl" scope="col"><?php echo $lang_common['Topic'] ?></th>
<th class="tc2" scope="col"><?php echo $lang_common['Replies'] ?></th>
<th class="tc3" scope="col"><?php echo $lang_forum['Views'] ?></th>
<th class="tcr" scope="col"><?php echo $lang_common['Last post'] ?></th>
</tr>
</thead>
<tbody>
<?php
// Fetch list of topics to display on this page
if ($pun_user['is_guest'] || $pun_config['o_show_dot'] == '0')
{
// Without "the dot"
$sql = 'SELECT id, poster, subject, posted, last_post, last_post_id, last_poster, num_views, num_replies, closed, sticky, moved_to FROM '.$db->prefix.'topics WHERE forum_id='.$id.' ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
}
else
{
// With "the dot"
switch ($db_type)
{
case 'mysql':
case 'mysqli':
$sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.forum_id='.$id.' GROUP BY t.id ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
break;
case 'sqlite':
$sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.id IN(SELECT id FROM '.$db->prefix.'topics WHERE forum_id='.$id.' ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'].') GROUP BY t.id ORDER BY t.sticky DESC, t.last_post DESC';
break;
default:
$sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.forum_id='.$id.' GROUP BY t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to, p.poster_id ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
break;
}
}
$result = $db->query($sql) or error('Unable to fetch topic list', __FILE__, __LINE__, $db->error());
// If there are topics in this forum.
if ($db->num_rows($result))
{
while ($cur_topic = $db->fetch_assoc($result))
{
$icon_text = $lang_common['Normal icon'];
$item_status = '';
$icon_type = 'icon';
if ($cur_topic['moved_to'] == null)
$last_post = '<a href="viewtopic.php?pid='.$cur_topic['last_post_id'].'#p'.$cur_topic['last_post_id'].'">'.format_time($cur_topic['last_post']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['last_poster']).'</span>';
else
$last_post = ' ';
if ($pun_config['o_censoring'] == '1')
$cur_topic['subject'] = censor_words($cur_topic['subject']);
if ($cur_topic['moved_to'] != 0)
$subject = $lang_forum['Moved'].': <a href="viewtopic.php?id='.$cur_topic['moved_to'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
else if ($cur_topic['closed'] == '0')
$subject = '<a href="viewtopic.php?id='.$cur_topic['id'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
else
{
$subject = '<a href="viewtopic.php?id='.$cur_topic['id'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
$icon_text = $lang_common['Closed icon'];
$item_status = 'iclosed';
}
if (!$pun_user['is_guest'] && $cur_topic['last_post'] > $pun_user['last_visit'] && $cur_topic['moved_to'] == null)
{
$icon_text .= ' '.$lang_common['New icon'];
$item_status .= ' inew';
$icon_type = 'icon inew';
$subject = '<strong>'.$subject.'</strong>';
$subject_new_posts = '<span class="newtext">[ <a href="viewtopic.php?id='.$cur_topic['id'].'&action=new" title="'.$lang_common['New posts info'].'">'.$lang_common['New posts'].'</a> ]</span>';
}
else
$subject_new_posts = null;
// Should we display the dot or not? :)
if (!$pun_user['is_guest'] && $pun_config['o_show_dot'] == '1')
{
if ($cur_topic['has_posted'] == $pun_user['id'])
$subject = '<strong>·</strong> '.$subject;
else
$subject = ' '.$subject;
}
if ($cur_topic['sticky'] == '1')
{
$subject = '<span class="stickytext">'.$lang_forum['Sticky'].': </span>'.$subject;
$item_status .= ' isticky';
$icon_text .= ' '.$lang_forum['Sticky'];
}
$num_pages_topic = ceil(($cur_topic['num_replies'] + 1) / $pun_user['disp_posts']);
if ($num_pages_topic > 1)
$subject_multipage = '[ '.paginate($num_pages_topic, -1, 'viewtopic.php?id='.$cur_topic['id']).' ]';
else
$subject_multipage = null;
// Should we show the "New posts" and/or the multipage links?
if (!empty($subject_new_posts) || !empty($subject_multipage))
{
$subject .= ' '.(!empty($subject_new_posts) ? $subject_new_posts : '');
$subject .= !empty($subject_multipage) ? ' '.$subject_multipage : '';
}
?>
<tr<?php if ($item_status != '') echo ' class="'.trim($item_status).'"'; ?>>
<td class="tcl">
<div class="intd">
<div class="<?php echo $icon_type ?>"><div class="nosize"><?php echo trim($icon_text) ?></div></div>
<div class="tclcon">
<?php echo $subject."\n" ?>
</div>
</div>
</td>
<td class="tc2"><?php echo ($cur_topic['moved_to'] == null) ? $cur_topic['num_replies'] : ' ' ?></td>
<td class="tc3"><?php echo ($cur_topic['moved_to'] == null) ? $cur_topic['num_views'] : ' ' ?></td>
<td class="tcr"><?php echo $last_post ?></td>
</tr>
<?php
}
}
else
{
?>
<tr>
<td class="tcl" colspan="4"><?php echo $lang_forum['Empty forum'] ?></td>
</tr>
<?php
}
?>
</tbody>
</table>
</div>
</div>
</div>
<div class="linksb">
<div class="inbox">
<p class="pagelink conl"><?php echo $paging_links ?></p>
<?php
echo $post_link;
if($cur_forum['parent_forum'])
echo "\t\t".'<ul><li><a href="index.php">'.$lang_common['Index'].'</a> </li><li>» <a href="viewforum.php?id='.$cur_forum['parent_forum_id'].'">'.pun_htmlspecialchars($cur_forum['parent_forum']).'</a> </li><li>» '.pun_htmlspecialchars($cur_forum['forum_name']).'</li></ul>';
else
echo "\t\t".'<ul><li><a href="index.php">'.$lang_common['Index'].' </a> </li><li>» '.pun_htmlspecialchars($cur_forum['forum_name']).'</li></ul>';
?>
<div class="clearer"></div>
</div>
</div>
<?php
$forum_id = $id;
$footer_style = 'viewforum';
require PUN_ROOT.'footer.php';
