如何在MVC中确定我的控制器？

I'm fairly new to MVC coming from a php background where I designed by view and created pages when I needed something like say a login form. I'd have a file called login. This only sucked when I needed a new login form to login a different type of user. Say an admin. I'd then have to create a new page called login-admin.php or something of that nature.I'm fairly new to MVC coming from a php backgro