Here you will learn how to show or hide a block on a forum. The instructions include as How-To info for the whole forum (forum/*) as well for its pages in viewing or editing mode.

Solution

In a block settings, check “Show if PHP-code returns TRUE (PHP-mode, experts only).” and enter one of the following code pieces below.

DON’T SHOW a block on forum PAGES:
*A block will be visible on pages with ‘forum/*’ URL

$result=true;
if ((arg(0) == ‘node’) && is_numeric(arg(1))) {
$node = node_load(arg(1));
if ( $node->type == “forum” )  $result=false;
}
return $result;

This code returns TRUE only if ‘forum’ node isn’t viewed this time. So a block is shown always except ‘forum’ node is currently opened.

Show a block ONLY on forum PAGES:
*Shows a block only on a forum pages (this includes viewing and editing of a forum nodes)

if (arg(0) == ‘forum’)   return TRUE;
if (arg(0) == ‘node’ && is_numeric(arg(1))) {
$result= db_fetch_object(db_query(“SELECT n.type FROM {node} AS n WHERE n.nid=%d LIMIT 1″, arg(1)));
if ($result->type == ‘forum’)     return TRUE;
}
return FALSE;

DON’T SHOW a block everywhere on a forum
*A block will be hide on a whole forum (this includes viewing and editing of a forum nodes)

if (arg(0)==’node’ && is_numeric(arg(1))){
$result= db_fetch_object(db_query(“SELECT n.type FROM {node} AS n WHERE n.nid=%d LIMIT 1″, arg(1)));
if ($result->type == ‘forum’)     return FALSE;
} elseif (arg(0)==’forum’)  return FALSE;
return TRUE;

DON’T show a block when viewing or editing a topic only:

if (arg(0)  ==  ‘node’ && arg(1)){
$result= db_fetch_object(db_query(“SELECT n.type FROM {node} AS n WHERE n.nid=%d LIMIT 1″, arg(1)));
return ($result->type != ‘forum’);
}

Showing a block when viewing or editing a ‘forum’ node is your homework =)