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preventing form tampering

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#1 Guest_kilbad_*

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Posted 02 September 2006 - 03:47 AM

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

#2 corbin

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Posted 02 September 2006 - 04:54 AM

$pattern = "/yourdomain.com/i";
if (!preg_match($domain, $_SERVER['HTTP_REFERER'])) {
die("Please visit the page thru <a href=\"http://yourdomain.com/page.ext\">Here</a>");

Should work...
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