troubleshooting Question

PHP: How can I detect if a user came from a Search Engine

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davideo7Flag for United States of America asked on
PHP
4 Comments4 Solutions549 ViewsLast Modified:
I have a site where I award user's Viz (currency) for giving users their referral url and when a person being referred clicks it, they person referring them gets the Viz.  However, a problem is that Google has indexed some of those url's with the referral code in them so what I want to do is detect if the referred user is coming from a Search engine and not award the Viz.
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