index.php

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<?php
// Bail if PHP is too low
if ( !function_exists( 'version_compare' ) || version_compare( PHP_VERSION, '5.3.2' ) < 0 ) {
    // We need to use dirname( __FILE__ ) here cause __DIR__ is PHP5.3+
    require dirname( dirname( __FILE__ ) ) . '/includes/PHPVersionError.php';
    wfPHPVersionError( 'mw-config/index.php' );
}

define( 'MW_CONFIG_CALLBACK', 'Installer::overrideConfig' );
define( 'MEDIAWIKI_INSTALL', true );

// Resolve relative to regular MediaWiki root
// instead of mw-config subdirectory.
chdir( dirname( __DIR__ ) );
require dirname( __DIR__ ) . '/includes/WebStart.php';

wfInstallerMain();

function wfInstallerMain() {
    global $wgRequest, $wgLang, $wgMetaNamespace, $wgCanonicalNamespaceNames;

    $installer = InstallerOverrides::getWebInstaller( $wgRequest );

    if ( !$installer->startSession() ) {

        if ( $installer->request->getVal( "css" ) ) {
            // Do not display errors on css pages
            $installer->outputCss();
            exit;
        }

        $errors = $installer->getPhpErrors();
        $installer->showError( 'config-session-error', $errors[0] );
        $installer->finish();
        exit;
    }

    $fingerprint = $installer->getFingerprint();
    if ( isset( $_SESSION['installData'][$fingerprint] ) ) {
        $session = $_SESSION['installData'][$fingerprint];
    } else {
        $session = array();
    }

    if ( !is_null( $wgRequest->getVal( 'uselang' ) ) ) {
        $langCode = $wgRequest->getVal( 'uselang' );
    } elseif ( isset( $session['settings']['_UserLang'] ) ) {
        $langCode = $session['settings']['_UserLang'];
    } else {
        $langCode = 'en';
    }
    $wgLang = Language::factory( $langCode );

    $installer->setParserLanguage( $wgLang );

    $wgMetaNamespace = $wgCanonicalNamespaceNames[NS_PROJECT];

    $session = $installer->execute( $session );

    $_SESSION['installData'][$fingerprint] = $session;

}