Manual:$wgHiddenPrefs

User accounts, authentication: $wgHiddenPrefs
Disable certain user preferences.
Introduced in version:	1.16.0 (r50782)
Removed in version:	Still in use
Allowed values:	(array)
Default value:	Unspecified
Other settings: Alphabetical | By function

Details

$wgHiddenPrefs is an array to disable certain user preferences (preferences system was rewritten in 1.16).

This obsoletes $wgAllowRealName = false; with the following code:

$wgHiddenPrefs[] = 'realname';

For a list of preference names and what they do, see Manual:$wgDefaultUserOptions#Available_preferences.