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Available from version 1.26.0
Called after user groups are changed.
Define function:
public static function onUserGroupsChanged( User $user, array $added, array $removed, $performer, $reason, $oldUGMs, $newUGMs ) { ... }
Attach hook:

In extension.json:

	"Hooks": {
		"UserGroupsChanged": "MyExtensionHooks::onUserGroupsChanged"

For MediaWiki ≤1.25:

$wgHooks['UserGroupsChanged'][] = 'MyExtensionHooks::onUserGroupsChanged';
Called from:File(s):

For more information about attaching hooks, see Manual:Hooks.
For examples of extensions using this hook, see Category:UserGroupsChanged extensions.


  • $user: User whose groups changed
  • $added: Groups added
  • $removed: Groups removed
  • $performer: User who performed the change, false if via autopromotion
  • $reason (added in MW 1.28): Reason/log comment for the change, or false if via autopromotion
  • $oldUGMs (added in MW 1.31): old user group memberships (as returned by $user->getGroupMemberships())
  • $newUGMs (added in MW 1.31): new user group memberships


Added in MediaWiki 1.26 as part of the upcoming AuthManager system. Replaces the AuthPlugin::updateExternalDBGroups() method call.

See alsoEdit