Contao\CoreBundle\Framework\ContaoFramework::setConstants PHP Method

    private function setConstants()
    {
        if (!defined('TL_MODE')) {
            define('TL_MODE', $this->getMode());
        }
        define('TL_START', microtime(true));
        define('TL_ROOT', dirname($this->rootDir));
        define('TL_REFERER_ID', $this->getRefererId());
        if (!defined('TL_SCRIPT')) {
            define('TL_SCRIPT', $this->getRoute());
        }
        // Define the login status constants in the back end (see #4099, #5279)
        if (!$this->isFrontendScope()) {
            define('BE_USER_LOGGED_IN', false);
            define('FE_USER_LOGGED_IN', false);
        }
        // Define the relative path to the installation (see #5339)
        define('TL_PATH', $this->getPath());
    }