> Maybe a daft question but why would you like to check for a
> specific value?
> 
> Can you give an example when this is a good thing to do?

You might have two submit buttons, where you want to take a different
action depending upon which one the user clicks.

Chris

=====
Chris Shiflett - http://shiflett.org/

PHP Security - O'Reilly     HTTP Developer's Handbook - Sams
Coming February 2005        http://httphandbook.org/

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