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Either that's not the code you're using on that page or you're buffering the HTML and modifying it elsewhere. I can't find a reference in the PHP to the HTML mentioned in the first error, for example.

Yeah, I'll be rewriting bits of moderate.php at some point to be more consistent (and thus avoid issues like this).

Yes, that's the meaning of "don't define it": don't have the line, period.

As I said, look at the third example. It has the exact correct syntax for generating the array AND for the array_multisort call.
Anyway, I'll modify your code so that it should at least sort the array properly.

$result = $db->query('SELECT id, size_inches, size_decimal, normal_lbs, 144inch_lbs FROM '.$db->prefix.'sizes WHERE alloy_id='.$id.' ORDER BY size_decimal ASC') or error('Unable to fetch size information', __FILE__, __LINE__, $db->error());
$sizes = array();
$size_decimal = array();
while ($cur_size = $db->fetch_assoc($result))
{
$sizes[] = $cur_size;
$size_decimal[] = $cur_size['size_decimal'];
}

array_multisort($data['size_decimal'], SORT_ASC, SORT_REGULAR, $sizes);

foreach ($sizes as $cur_size)
{    
echo '<tr style="text-align: center;"><td style="border: 0;">'.$cur_size['size_inches'].'</td><td style="border: 0;">'.$cur_size['size_decimal'].'</td><td style="border: 0;">'.$cur_size['normal_lbs'].'</td><td style="border: 0;">'.$cur_size['144inch_lbs'].'</td>';
if(!$pun_user['is_guest'])
echo '<td style="border: 0;"><a href="deletesize.php?id='.$cur_size['id'].'">delete</a></td>';

echo '</tr>';
}

Ghirai: Yeah, I know why it would be happening, the question in that case is why PHP is not using the alternative syntax.

Well, Googling the error message turned up some interesting results, but nothing that sheds any light on why PHP would be escaping something improperly. If you have any ideas or more details, that would be great.

Take a look at the example again, you're doing it wrong

Yes, edit login.php so the logout redirects somewhere other than the forum index.

Where it can be found in PunBB's code? header.php.
And you edit the $required_fields array in register.php to add fields to it.

The same way 1.2 and 1.3 are: yes, you just need to run a script to make sure the schema is up to date.

Mmm, I wouldn't prune it, it's useful to have. It's just better to have some logical divisions.
This is why some larger forums by default only display topics posted in within the past x days. It means a smaller number of topics are searched through on each pageview.