SpecialUserLogout.php

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<?php
class SpecialUserLogout extends UnlistedSpecialPage {
    function __construct() {
        parent::__construct( 'Userlogout' );
    }

    public function doesWrites() {
        return true;
    }

    function execute( $par ) {
        if ( isset( $_SERVER['REQUEST_URI'] ) && strpos( $_SERVER['REQUEST_URI'], '&amp;' ) !== false ) {
            wfDebug( "Special:UserLogout request {$_SERVER['REQUEST_URI']} looks suspicious, denying.\n" );
            throw new HttpError( 400, $this->msg( 'suspicious-userlogout' ), $this->msg( 'loginerror' ) );
        }

        $this->setHeaders();
        $this->outputHeader();

        // Make sure it's possible to log out
        $session = MediaWiki\Session\SessionManager::getGlobalSession();
        if ( !$session->canSetUser() ) {
            throw new ErrorPageError(
                'cannotlogoutnow-title',
                'cannotlogoutnow-text',
                [
                    $session->getProvider()->describe( RequestContext::getMain()->getLanguage() )
                ]
            );
        }

        $user = $this->getUser();
        $oldName = $user->getName();

        $user->logout();

        $loginURL = SpecialPage::getTitleFor( 'Userlogin' )->getFullURL(
            $this->getRequest()->getValues( 'returnto', 'returntoquery' ) );

        $out = $this->getOutput();
        $out->addWikiMsg( 'logouttext', $loginURL );

        // Hook.
        $injected_html = '';
        Hooks::run( 'UserLogoutComplete', [ &$user, &$injected_html, $oldName ] );
        $out->addHTML( $injected_html );

        $out->returnToMain();
    }

    protected function getGroupName() {
        return 'login';
    }
}