class Tx_Myext_Eid_MyOwnEidScript implements t3lib_Singleton {

    /**
     * @var tslib_fe
     */
    protected $tslibFe;

    /**
     *
     * @return string
     */
    public function main() {
        $this->setupEnvironment();
        // Own code here
    }

    /**
     * setupEnvironment
     *
     * Interacts with self::exportTslibFe.
     *
     * Workflow:
     *  1  self::setupEnvironment registers self::exportTslibFe as hook for tslib_fe
     *  2  self::setupEnvironment creates tslib_fe
     *  3  tslib_fe calls self::exportTslibFe
     *  4  self::exportTslibFe exports tslib_fe
     *  5  self::setupEnvironment has access to the now exported tslib_fe
     */
    protected function setupEnvironment() {

        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['initFEuser'][] = '&Tx_Myext_Eid_MyOwnEidScript->exportTslibFe';

        tslib_eidtools::connectDB();
        tslib_eidtools::initFeUser();

        $this->tslibFe->initUserGroups();
        $this->tslibFe->initializeBackendUser();

    }

    /**
     * exportTslibFe
     *
     * Workflow:
     *  1  self::setupEnvironment registers self::exportTslibFe as hook for tslib_fe
     *  2  self::setupEnvironment creates tslib_fe
     *  3  tslib_fe calls self::exportTslibFe
     *  4  self::exportTslibFe exports tslib_fe
     *  5  self::setupEnvironment has access to the now exported tslib_fe
     *
     * So this needs to be public because it gets called from tslib_fe
     * right after fe_user is present.
     *
     * @param array $params
     * @param tslib_fe $tslibFe
     * @return void
     */
    public function exportTslibFe(array $params, tslib_fe $tslibFe) {
        $this->tslibFe = $tslibFe;
    }
}