&$timestamp: timestamp, change this to override local email authentication
timestamp
-'UserGetImplicitGroups': DEPRECATED since 1.25!
-Called in User::getImplicitGroups().
-&$groups: List of implicit (automatically-assigned) groups
-
'UserGetLanguageObject': Called when getting user's interface language object.
$user: User object
&$code: Language code that will be used to create the object