Manual:BeforeParserFetchTemplateRevisionRecordHook.php

A hook handler interface called before a template is fetched by the Parser.

It allows redirection of the title and/or revision id of the template. For example, the template could be redirected to an appropriately localized version of the template; or the template fetch could be redirected to a 'stable revision' of the template.

If the returned RevisionRecord does not exist, its title will be added to the page dependencies and then this hook will be invoked again to resolve that title. This allows for fallback chains (of limited length).

Further documentation: Manual:Hooks/BeforeParserFetchTemplateRevisionRecord.