The classes in this directory are general utilities for use by any part of MediaWiki They do not favour any particular user interface and are not constrained to serve any particular feature This is similar to includes except that some dependency on the MediaWiki framework(such as the use of MWException, Status or wfDebug()) disqualifies them from use outside of MediaWiki without modification.Utilities should not use global configuration variables
processing should stop and the error should be shown to the user if you wanted to authenticate users to a custom system(LDAP, another PHP program, whatever)
The ContentHandler facility adds support for arbitrary content types on wiki instead of relying on wikitext for everything It was introduced in MediaWiki Each kind of and so on Built in content types are