$baseID: the revision ID this was based off, if any
$user: the editing user
-'NormalizeMessageKey': Called before the software gets the text of a message
-(stuff in the MediaWiki: namespace), useful for changing WHAT message gets
-displayed.
-&$key: the message being looked up. Change this to something else to change
- what message gets displayed (string)
-&$useDB: whether or not to look up the message in the database (bool)
-&$langCode: the language code to get the message for (string) - or -
- whether to use the content language (true) or site language (false) (bool)
-&$transform: whether or not to expand variables and templates
- in the message (bool)
-
'OldChangesListRecentChangesLine': Customize entire recent changes line, or
return false to omit the line from RecentChanges and Watchlist special pages.
&$changeslist: The OldChangesList instance.
&$legend: the legend text. Defaults to wfMessage( "prefs-$key" )->text() but may
be overridden
-'PrefixSearchBackend': Override the title prefix search used for OpenSearch and
+'PrefixSearchBackend': DEPRECATED! Override SearchEngine::completionSearchBackend instead.
+Override the title prefix search used for OpenSearch and
AJAX search suggestions. Put results into &$results outparam and return false.
$ns: array of int namespace keys to search in
$search: search term (not guaranteed to be conveniently normalized)
$added: Groups added
$removed: Groups removed
$performer: User who performed the change, false if via autopromotion
+$reason: The reason, if any, given by the user performing the change,
+false if via autopromotion.
'UserIsBlockedFrom': Check if a user is blocked from a specific page (for
specific block exemptions).