According to PHP.net, the predefined variable 'HTTP_REFERER' isn't reliable, and it states
Quote:
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"Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted."
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However, there is a user comment on the same page that supplies an alternative, found
here. Not sure how well it'll work, but might be worth a try if you're having trouble with the referer veriable.
