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Ask how to get the source of the user

Source: Internet
Author: User
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How can I get the source of the user?
I want to know the user to open a URL before a URL, such as you first visit a.com and then to B.Com, want to know on B.Com know you are from a.com, and in the URL in the form of from=a.com, how to get this information?

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$_server["Http_referer"]
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Only by clicking through the Js.flash. Just open up and so on. It's not available.
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Defines a unique identity, passing a unique identity.
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Explore
$_server["Http_referer"]

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PHP Code 
$_server["Http_referer"]

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