for flags such as register_globals try
php_flag register_globals on
However, if your host has used php_admin_flag or php_admin_value in one of the httpd configuration files then you can not override this via .htaccess/ini_set etc.
Another possible issue (which would produce the error you are getting) is PHP may be running as a CGI in which case the .htaccess flags won't work anyway.
MVC is the current buzz in web application architectures. It comes from event-driven desktop application design and doesn't fit into web application design very well. But luckily nobody really knows what MVC means, so we can call our presentation layer separation mechanism MVC and move on. (Rasmus Lerdorf)