Display block only for forums
This code returns TRUE when user views 'forum zone' - i.e. forum, forum/* or a node that is a forum topic. This means, if you use that code, you can display block only on pages that are in forum.
This code can be easily modified to do the opposite - return TRUE only for not-forum pages.
<?php
if (arg(0) == 'forum') {
return TRUE;
}
if (arg(0) == 'node' && ctype_digit(arg(1))) {
$node = node_load(arg(1));
if ($node->type == 'forum') {
return TRUE;
}
}
return FALSE;
?>