How to force POST verb only for action method

[eluser]deepakaggarwal[/eluser]
I did

Code:

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    show_404();
}
else
{
//my code
}

thanks all!

Reason I was looking for this: I want to have a controller which displays form when GET otherwise performs operation. For example, GET:// AddUser() will display new user form while POST:// AddUser() will perform operation and display thank you. This will help me in having one action method and play with verbs.