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preventing form tampering


Guest kilbad

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If I have a form that begins with:: <form action="some_script.php" method="post">  what are some PHP techniques for preventing someone from making their own form that refers back to my script inorder to spam me, like:: <form action="HTTP://WWW.MYDOMAIN.COM/some_script.php" method="post">.  How can I prevent this type of "hotlinking" (if that is the right term, I know it is used for linking to images).

Specifically, I have been reading about using HTTP_REFERER in the some_script.php to check that it is a local request, but I am not sure how to go about this.

Thanks in advance!  brendan
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