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Manual:$wgRemoveGroups

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User rights, access control and monitoring: $wgRemoveGroups
Controls who can remove specific groups using Special:Userrights.
Introduced in version:1.11.0
Removed in version:Still in use
Allowed values:(array)
Default value:[]

Details

If a group can remove any right (example: bureaucrats can remove any right):

$wgRemoveGroups['bureaucrat'] = true;

If a group remove only some rights (example: bureaucrats can remove only sysop and bot groups):

$wgRemoveGroups['bureaucrat'] = array( 'sysop', 'bot' );
MediaWiki version:
1.12

Note that groups which may only grant some rights (like bureaucrats in this example) need to have the userrights privilege set to false, otherwise they will still be able to remove all groups.

You can also define $wgRemoveGroups in a way that does not overwrite an extension's definition:

$wgRemoveGroups['bureaucrat'][] = 'sysop';
$wgRemoveGroups['bureaucrat'][] = 'bot';

Troubleshooting

Not seeing permission checkboxes

If after setting this, you do not see the group checkboxes on the Special:Userrights page for a particular user, it might mean that they've already been removed from that group and that the groups you are in do not allow the removal of a user from other groups.

Once a user has been removed from a group, defined by this setting the group checkbox for this group will only show up if $wgAddGroups is also set for the group in question.

See also