Reject Bad Visitors

I noticed from some of my logs of visitors that some of them were
more interested in trying to trip up a badly written script or a web server by stuffing a .php URL with tons of variables. Even sometimes taking variables which were in use and using them with bizarre values or adding lots of other irrelevant variables.

reject-variable-stuffers/php

This first script is suitable for any .php file which doesn't expect any variables passed to it for recovery by $_GET.  It checks and if there are any variables appended to the URL it exits with an appropriate message.