Signed request not available in Facebook app on submitting form?

I am developing a Facebook application for use on page. It’s essential a page with a web form that then creates a database record form the submitted data. Nothing too complex. The complexity comes when I try to differentiate between the sites when handling the post data. This is what I have:

This is just an educated guess, but I think you must include the signed request as a hidden field in order to pass it on after you POST the form…

So:

<input type="hidden" name="signed_request" value="<? print $_REQUEST['signed_request']; ?>">

http://stackoverflow.com/questions/5514167/signed-request-not-available-in-facebook-app-on-submitting-form

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