index.php

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<?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() ) {
        $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;

}