SpecialUserlogout.php

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<?php
class SpecialUserlogout extends UnlistedSpecialPage {

        function __construct() {
                parent::__construct( 'Userlogout' );
        }

        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();

                $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.
                $injected_html = '';
                wfRunHooks( 'UserLogoutComplete', array( &$user, &$injected_html, $oldName ) );
                $out->addHTML( $injected_html );

                $out->returnToMain();
        }

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