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I am in the process of modifying my PunBB installation to use <object> tags instead of <img> tags for more alternative content options and  for future compatibility. I am almost finished making the changes and while I have encountered a few a problems in the process, only one problem (that I know of) remains:

The "type" attribute in the <object> tag contains the mime type for the media used in the object.

For example, this is how the PHP would output the HTML for the .png icon:

<object type="image/png" data="http://www.w3.org/Icons/valid-css.png" width="88" height="31">Valid CSS&#32;</object>

What I want the PHP to do is look for the data file (in this example, valid-css.png) and automatically fill in the mime type in the type attribute type="image/png"

Let's say that a forum user decided to embed a .gif image. How could I rewrite the following PHP (from ../include/parser.php) to automatically write type="image/gif" or write type="image/jpeg" for a .jpg?

Original:

if ($is_signature && $forum_user['show_img_sig'] != '0')
        $img_tag = '<img class="sigimage" src="'.$url.'" alt="'.forum_htmlencode($alt).'" />';
    else if (!$is_signature && $forum_user['show_img'] != '0')
        $img_tag = '<span class="postimg"><img src="'.$url.'" alt="'.forum_htmlencode($alt).'" /></span>';

My current modifications:

    if ($is_signature && $forum_user['show_img_sig'] != '0')
        $img_tag = '<object type="image/png" data="'.$url.'" class="sigimage">'.forum_htmlencode($alt).'</object>';
    else if (!$is_signature && $forum_user['show_img'] != '0')
        $img_tag = '<span class="postimg"><object type="image/png" data="'.$url.'">'.forum_htmlencode($alt).'</object></span>';

For the most part, my PunBB installation has been working as intended. I recently noticed a problem when trying to change some settings in my Administration panel, under Settings. Whenever I try to change settings under Setup, Features, Announcements, E-mail, or Registration (my Censoring and Attachments settings pages seem to be properly functioning), after pressing the "Save Changes" button, I receive a blank page in my browser window. When I view the source of the document, the following is what it shows:

<?
/***********************************************************************

    Copyright (C) 2008-2009 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

***********************************************************************/

if (!defined('FORUM'))
    exit;

function pun_log_write_logfile( $str )
{
    global $forum_config;
    $hf = fopen($forum_config['o_pun_admin_path_log_file'], 'a+');

    if ($hf)
    {
        fwrite($hf, $str);
        fclose($hf);
    }
}

function record_log_file($action, $comment)
{
    global $forum_user;
    return '['.date('j-M-Y H:i:s').']'."\t[".$forum_user['id']."]\t".$forum_user['username']."\t".$action."\t".$comment."\n";
}

?>

It seems as if an entire PHP file has simply been inserted without being correctly processed. So far, this problem only seems to be affecting my settings.php file, and only when I attempt to actually change those settings. What might be causing this sort of response?

I installed the antispam extension without any trouble. For most purposes, it works. However, I soon noticed that the included img tags in manifest.xml have empty alt attributes. When I tried to place text inside of them, it had no effects on the resulting pages. To be sure, I even saved the file as blank, but still, no changes took place. I'm so close to getting my installation to http://www.w3.org/WAI/WCAG1AA-Conformance level two accessibility conformance, but I still need the alt attribute to contain something.
Is there a file other than manifest.xml which I need to change?