Manual:index.php

As of MediaWiki version 1.18, some of the startup logic has been moved from index.php, and index.php performs the following actions:

• Check the version of PHP and if its not 5.2.3 or higher, display an error.
• Include WebStart.php, which in turn includes LocalSettings.php, Setup.php and some other files.
• Instantiate a MediaWiki object called $mediaWiki, which is defined in MediaWiki.php.
• Call $mediaWiki->run().