Manual:DefaultSettings.php/en

DefaultSettings.php contains default configuration settings. DefaultSettings.php should not be edited, since any changes made to it will be lost when MediaWiki is upgraded. Rather, changes should be made to LocalSettings.php.

Link

 * https://svn.wikimedia.org/doc/DefaultSettings_8php_source.html
 * https://github.com/wikimedia/mediawiki-core/blob/master/includes/DefaultSettings.php