$tokenFunctions array and return true (returning false makes no sense)
$tokenFunctions: array(action => callback)
+'APIQueryUsersTokens': use this hook to add custom token to list=users.
+Every token has an action, which will be used in the ustoken parameter
+and in the output (actiontoken="..."), and a callback function which
+should return the token, or false if the user isn't allowed to obtain
+it. The prototype of the callback function is func($user) where $user
+is the User object. In the hook, just add your callback to the
+$tokenFunctions array and return true (returning false makes no sense)
+$tokenFunctions: array(action => callback)
+
'ArticleAfterFetchContent': after fetching content of an article from the database
$article: the article (object) being loaded from the database
$content: the content (string) of the article
$user: user that watched
$article: article object watched
+'WikiExporter::dumpStableQuery': Get the SELECT query for "stable" revisions dumps
+One, and only one hook should set this, and return false.
+&$tables: Database tables to use in the SELECT query
+&$opts: Options to use for the query
+&$join: Join conditions
+
'wgQueryPages': called when initialising $wgQueryPages, use this to add new query pages to be updated with maintenance/updateSpecialPages.php
$query: $wgQueryPages itself