Custom word filter for Discussion Forum module

Hi,

I’m having an issue adding some PHP to the Discussion Forum’s template files. I know EE has a site-wide word censoring feature but ideally we’d limit it to just the forums (there’s a reason). I’ve found code that works fine on a non-EE test page but trying to add it to the thread_rows function produces errors.

Depending on how I’ve tried to integrate it, it’s resulted in the dreaded white screen, blank posts in a perfect page otherwise (i.e. the {body} variable isn’t called correctly) or relatively normal (but unfiltered) posts with some of the PHP printed out after the post body.

The relevant part of the theme_threads.php template is (note: only the {body} section needs to be filtered):

function thread_rows()
{
return <<< EOF

<--- Code for ignore list, member info, [Report] links, etc. --->

<td class="tableCellOne" valign="top" colspan="2">
    <div class="post">
    {body}
    </div>
    {if edited}<div class="edited"><em>[ {lang:edited}: {edit_date format="%D %j %F %Y at %H:%i"} {lang:by} <a href="http://{path:edit_author_profile}">{edit_author}</a> ]</em></div>{/if}
    {if attachments}
    {include:post_attachments}
    {/if}
    {if signature}
    {include:signature}
    {/if}
</td>

<--- Code for edit butons, mod buttons, etc. --->

EOF;
}

The code, taken from http://www.codingforums.com/showthread.php?t=135849 is:

include ("filter.php"); //NOTE: This call works fine in a non-EE test page.
$str = <<<EOF
<--- Whatever you need filtered goes here so I've tried a few ways of getting {body} in here --->
EOF;
// bad words:
$replace_str = "whatever you want to replace the bad words with";
$bad_words = array('word 1 to replace','word 2 to replace');
print ReplaceBadWords($str, $bad_words, $replace_str);

I’ve made changes to the templates relatively comfortably before but haven’t quite been able to figure this one out alone. Problem would seem likely to be the conflicting EOF calls though? Even a way to include the filter in the core files where {body} is defined would be an option as we won’t be upgrading the forum install. Any help appreciated…