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HElp me to predict or check by pinging or by any other method whether an external website (not owned by me) will send me a value for $_SERVER['HTTP_REFERER']. I do not have control from that website(external) to check.

Thanks in advance!

Kitty
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1 Answers1

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You can't.

The HTTP_REFERER is not sent by a website but by the user's browser. A browser should send the referer every time the users follows a link, but you can't trust this information. There are several things that can filter this information such as browser extensions.

Enrico Dias
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