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Necessary to validate post data


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Yeah, it is possible to hack with POST variables.  Basically ANY information users submit to your site can be modified so as to hack.


The way I prevent hacking with AJAX is I send a request to put some data in a database.  If the data does not check out (after processing with a PHP script), I send back an <errormessage> node with a relevant error message.  If it does check out, I send back a <success /> node.


I wrote a pretty brief/general post on checking user input on my blog, you might find it useful: http://www.ironcoding.com/?p=37.

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