WebInstallerLanguage.php

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<?php
class WebInstallerLanguage extends WebInstallerPage {

    public function execute() {
        global $wgLang;
        $r = $this->parent->request;
        $userLang = $r->getVal( 'uselang' );
        $contLang = $r->getVal( 'ContLang' );

        $languages = Language::fetchLanguageNames();
        $lifetime = intval( ini_get( 'session.gc_maxlifetime' ) );
        if ( !$lifetime ) {
            $lifetime = 1440; // PHP default
        }

        if ( $r->wasPosted() ) {
            # Do session test
            if ( $this->parent->getSession( 'test' ) === null ) {
                $requestTime = $r->getVal( 'LanguageRequestTime' );
                if ( !$requestTime ) {
                    // The most likely explanation is that the user was knocked back
                    // from another page on POST due to session expiry
                    $msg = 'config-session-expired';
                } elseif ( time() - $requestTime > $lifetime ) {
                    $msg = 'config-session-expired';
                } else {
                    $msg = 'config-no-session';
                }
                $this->parent->showError( $msg, $wgLang->formatTimePeriod( $lifetime ) );
            } else {
                if ( isset( $languages[$userLang] ) ) {
                    $this->setVar( '_UserLang', $userLang );
                }
                if ( isset( $languages[$contLang] ) ) {
                    $this->setVar( 'wgLanguageCode', $contLang );
                }

                return 'continue';
            }
        } elseif ( $this->parent->showSessionWarning ) {
            # The user was knocked back from another page to the start
            # This probably indicates a session expiry
            $this->parent->showError( 'config-session-expired',
                $wgLang->formatTimePeriod( $lifetime ) );
        }

        $this->parent->setSession( 'test', true );

        if ( !isset( $languages[$userLang] ) ) {
            $userLang = $this->getVar( '_UserLang', 'en' );
        }
        if ( !isset( $languages[$contLang] ) ) {
            $contLang = $this->getVar( 'wgLanguageCode', 'en' );
        }
        $this->startForm();
        $s = Html::hidden( 'LanguageRequestTime', time() ) .
            $this->getLanguageSelector( 'uselang', 'config-your-language', $userLang,
                $this->parent->getHelpBox( 'config-your-language-help' ) ) .
            $this->getLanguageSelector( 'ContLang', 'config-wiki-language', $contLang,
                $this->parent->getHelpBox( 'config-wiki-language-help' ) );
        $this->addHTML( $s );
        $this->endForm( 'continue', false );

        return null;
    }

    public function getLanguageSelector( $name, $label, $selectedCode, $helpHtml = '' ) {
        global $wgDummyLanguageCodes;

        $output = $helpHtml;

        $select = new XmlSelect( $name, $name, $selectedCode );
        $select->setAttribute( 'tabindex', $this->parent->nextTabIndex() );

        $languages = Language::fetchLanguageNames();
        ksort( $languages );
        foreach ( $languages as $code => $lang ) {
            if ( isset( $wgDummyLanguageCodes[$code] ) ) {
                continue;
            }
            $select->addOption( "$code - $lang", $code );
        }

        $output .= $select->getHTML();
        return $this->parent->label( $label, $name, $output );
    }

}