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MediaWiki extensions manual
OOjs UI icon advanced.svg
Release status: unmaintained
Implementation Special page , Search, Data extraction
Description Maintains a table with hash values for category intersections within a page to allow searching category intersections
Author(s) Magnus Mansketalk
Database changes Yes
License GNU General Public License 2.0 or later
Download Template:WikimediaDownload/svn
Translate the CategoryIntersection extension if it is available at translatewiki.net
Check usage and version matrix.

The CategoryIntersection extension provides a special page - Special:CategoryIntersection. You put in a list of categories to this page (separated by newlines), and the extension returns the articles that are in all the categories listed. It stores hashes of what categories a page is in a separate table in db to (I assume) make things efficient. Somewhat akin to the DynamicPageList extensions (but probably much more efficient).

This extension might not handle a single page being in a large number of categories very well.


To install this extension, do the following:

  • Download and place the file(s) in a directory called CategoryIntersection in your extensions/ folder.
  • Add the following code at the bottom of your LocalSettings.php:
    require_once "$IP/extensions/CategoryIntersection/CategoryIntersection.php";
  • Run the update script which will automatically create the necessary database tables that this extension needs.
  • Run the refreshLinks.php maintenance script.
Warning Warning: This may take a long time if you have a lot of pages on your wiki. If you don't do this step, the extension will only find pages that had their categories added after the extension was installed
  • Yes Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.