Manual:AdminSettings.php

Overview
The file AdminSettings.sample in your main directory (f.i., /localhost/wiki/) should be copied to AdminSettings.php, and modified to reflect local settings.

It is required for the maintenance scripts which run on the command line, as an extra security measure to allow using a separate user account with higher privileges to do maintenance work..

Wikidb Administrator's username and password
The $wgDBadminuser and $wgDBadminpassword variables identify an SQL user who will be enabled to all database maintenance scripts (see directory maintenance/). Default settings are: The SQL user must be manually created or set to an existing user with necessary permissions. This is not to be confused with sysop accounts for the wiki.

Enabling/Disabling profileinfo.php
The wgEnableProfileInfo variable enables the profileinfo.php script. The default value is: