index.php

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

chdir( dirname( __DIR__ ) );
if ( isset( $_SERVER['MW_COMPILED'] ) ) {
        require ( 'core/includes/WebStart.php' );
} else {
        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;

}