Extension:GlobalUsage

The GlobalUsage extension allows to view the global usage of images in a wiki farm with shared image repository. It adds Special:GlobalUsage as well as a list of pages that include the image on image description pages.

Remarks
To get the right links to the sites and pages under "Global file usage" one of the following conditions must be met
 * the databases follow Wikimedia's database naming convention: languagesuffix like 'enwiki', 'commonswiki' etc.
 * a site configuration object ($wgConf) is created with an array for $wgCanonicalServer and $wgArticlePath for all wikis
 * the extension is patched to use the information in the interwiki table.

API
Extension:GlobalUsage includes an API extension that allows bots and other programs to query the global usage of a file. For example, this query on Wikimedia Commons returns global uses of File:Example.jpg:

By default this returns only 10 results. The next 10 results can be retrieved using the gucontinue parameter included in the result above:

The number of results returned is set with the  parameter. The  parameter sets which properties to retrieve. The  parameter, when set to 1, will exclude uses on the same wiki as the file (e.g. on Commons). The following query retrieves all properties and up to 100 results, excluding local uses: