Manual:$wgSpecialPages

Details
$wgSpecialPages stores a list of custom special pages defined for a MediaWiki installation. The array is keyed by a non-localized id for the special page. The values assigned to each key may take one of two forms:


 * string: a string containing the name of a subclass of SpecialPage.
 * array: an array where the first element is the name of the subclass and all remaining elements are parameters that should be passed to the constructor of that subclass.

The format is one of:
 * array( 'SpecialPage', name, right )
 * array( 'IncludableSpecialPage', name, right, listed? )
 * array( 'UnlistedSpecialPage', name, right )
 * array( 'SpecialRedirectToSpecial', name, page to redirect to, special page param, ... )

For more information, please see SpecialPage.php