Manual:$wgExtraNamespaces

Namespaces: $wgExtraNamespaces
Additional namespaces.
Introduced in version:	1.3.3
Removed in version:	still in use
Allowed values:	array
Default value:	NULL

Other settings: Alphabetical | By Function

Details

$wgExtraNamespaces is used to configure additional, custom namespaces for a wiki. It can also be used to rename the default namespaces.

This is covered in detail on Manual:Using custom namespaces. Note that the first custom namespace should use the ID 100, as IDs from 0 to 99 are reserved (and negative IDs have a special meaning). The maximum namespace ID was 255 on some older (pre-1.5) MediaWiki versions, but 16-bit namespace numbers (-32768 through 32767) are supported in all current releases.

When you define a namespace or set a name of a namespace (including talk pages) to something which contains a space, use an underscore in place of the space. For example, 'My Namespace' or 'My Namespace Talk' is an invalid name and will cause problems. Instead, use 'My_Namespace' or 'My_Namespace_Talk' in the namespace definition.

Example

To add a namespace with the name 'Foo' to your wiki you need to create 2 new namespaces (even number for the Foo page and odd number for its associated talk page):

define("NS_FOO", 100);
define("NS_FOO_TALK", 101);
 
$wgExtraNamespaces[NS_FOO] = "Foo";
$wgExtraNamespaces[NS_FOO_TALK] = "Foo_talk";

See also

• Namespace IDs used by extensions – Shows you a list of namespace IDs you should definitely avoid to prevent namespace conflicts, thus the first custom namespace may encounter conflicts even at ID 110 though 100 is theoretically possible.
• Manual:$wgExtraGenderNamespaces