LogoutController.php

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<?php
namespace TYPO3\CMS\Backend\Controller;

use TYPO3\CMS\Core\Utility\GeneralUtility;

class LogoutController {

    public function logout() {
        if (!empty($GLOBALS['BE_USER']->user['username'])) {
            // Logout written to log
            $GLOBALS['BE_USER']->writelog(255, 2, 0, 1, 'User %s logged out from TYPO3 Backend', array($GLOBALS['BE_USER']->user['username']));
            \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get()->removeSessionTokenFromRegistry();
            $GLOBALS['BE_USER']->logoff();
        }
        $redirect = GeneralUtility::sanitizeLocalUrl(GeneralUtility::_GP('redirect'));
        $redirectUrl = $redirect ? $redirect : 'index.php';
        \TYPO3\CMS\Core\Utility\HttpUtility::redirect($redirectUrl);
    }

}