-'DeleteUnknownPreferences': Called by the cleanupPreferences.php maintenance script to build a WHERE clause with which
-to delete preferences that are not known about. This hook is used by extensions that have dynamically-named preferences
-that should not be deleted in the usual cleanup process. For example, the Gadgets extension creates preferences prefixed
-with 'gadget-', and so anything with that prefix is excluded from the deletion.
-&where: An array that will be passed as the $cond parameter to IDatabase::select() to determine what will be deleted
- from the user_properties table.
+'DeleteUnknownPreferences': Called by the cleanupPreferences.php maintenance
+script to build a WHERE clause with which to delete preferences that are not
+known about. This hook is used by extensions that have dynamically-named
+preferences that should not be deleted in the usual cleanup process. For
+example, the Gadgets extension creates preferences prefixed with 'gadget-', and
+so anything with that prefix is excluded from the deletion.
+&where: An array that will be passed as the $cond parameter to
+ IDatabase::select() to determine what will be deleted from the user_properties
+ table.