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Prevent certain terms from displaying in dynamically generated PHP

Asked by mycarefreepc in PHP Scripting Language, Apache Web Server

Tags: php, prevent abuse

I've got the following code on my landing pages so that I can dynamically generate the keyword the searcher used to arrive on the page through my paid advertising campaigns.  (which the code works fine thanks to some help from EE).

<?php
if ($_GET['key'])
{echo htmlentities(ucwords($_GET['key']));}
else
{echo ucwords("Your Original Info Here");}
?>

Problem is, I can see this possibly being abused by some jokers who want funny screen shots as obviously I can pass any words I want to the page now.  Is it possible to blacklist certain phrases or words?  Is there an approach to this?

If someone types test.html?key=You Suck  I don't necessarily want a screen shot taken of my website saying this.  Does this make sense or am I being paranoid... ?

Thanks
[+][-]11/04/09 01:13 AM, ID: 25737565Expert Comment

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[+][-]11/04/09 01:24 AM, ID: 25737611Author Comment

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[+][-]11/04/09 01:28 AM, ID: 25737631Expert Comment

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[+][-]11/04/09 01:52 AM, ID: 25737741Author Comment

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[+][-]11/04/09 01:58 AM, ID: 25737770Expert Comment

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[+][-]11/06/09 06:18 PM, ID: 25764701Author Comment

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[+][-]11/11/09 09:05 AM, ID: 25796815Author Comment

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