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';
    }
}