testThis.class.php

This class allows you to test constraints using one line of code.
This is usefull if you are checking for required conditions at the top of a
page. It hase 2 action levels for a return of false -- 1 displays an
error message (customizable) and kills the execution of the script. 2 returns
a false and displays the error message. There is also an example on how to
create additional methods. For this I chose to implement the file include
directives require() and include().