Manual:$wgNamespacesWithSubpages

Namespaces: $wgNamespacesWithSubpages
Which namespaces should support subpages?
Introduced in version:	pre 1.1.0
Removed in version:	still in use
Allowed values:	(see below)
Default value:	(see below)

Other settings: Alphabetical | By Function

Details

The variable holds an array indicating which namespaces allow sub-pages. The array is indexed by the numeric namespace ID, and each array value is either 0 (no sub-pages) or 1 (sub-pages allowed). A categoryspace (namespace 14) subpage will work like any other category.

See Help:Subpages

Enabling for a namespace

See also Manual:Namespace constants for a list of the NS_... codes.

The normal way to enable subpages for a given namespace is to edit the LocalSettings.php and insert the following:

# Enable subpages in the main namespace
$wgNamespacesWithSubpages[NS_MAIN] = true;
 
# Enable subpages in the template namespace
$wgNamespacesWithSubpages[NS_TEMPLATE] = true;
 
# etc.

Disabling for a namespace

Disable subpages in a namespace (where it is enabled by default). For example NS_TALK has subpages enabled by default in MediaWiki. To disable them, set false:

$wgNamespacesWithSubpages[NS_TALK] = false;

Enabling for all namespaces

# Enable subpages in all namespaces
$wgNamespacesWithSubpages = array_fill( 0, 200, true );

This assumes you have no more than 200 namespaces.

If you only wanted to enable subpages for all talk namespaces, you would use:

# Enable subpages in all talk namespaces
$arr = array_fill ( 0, 200, true );
foreach( $arr as $key => $value ) {
        if( $key & 1 ) { // Bit checking
                unset ( arr[$key] );
        }
}
$wgNamespacesWithSubpages = array_merge( $wgNamespacesWithSubpages, $arr );

Again, this assumes you have no more than 200 namespaces.

Default value

The default is to enable subpages, but not within the 'main' namespace. They are enabled only within talk pages and user pages.

Note: Enabling on all 'talk' pages actually requires many entries in this array; one for each talk namespace. Each version of MediaWiki only went as far as the maximum namespace existing at the time.

1.5.0 and above

 array(
        NS_TALK           => true,
        NS_USER           => true,
        NS_USER_TALK      => true,
        NS_PROJECT_TALK   => true,
        NS_IMAGE_TALK     => true,
        NS_MEDIAWIKI_TALK => true,
        NS_TEMPLATE_TALK  => true,
        NS_HELP_TALK      => true,
        NS_CATEGORY_TALK  => true
 );