Http_x_forwarded_for

hi i was writing a php script and wanted to find the complete(proxy+actual) ip address of a user.
i was trying to use HTTP_X_FORWARDED_FOR to do that..
however it always returns empty..
Is this variable still available in php

coz all the phpinfos i have seen nobody documents
HTTP_VIA
and HTTP_X_FORWARDED_FOR

Are these headers send at all? Not all proxies do..

Quote:

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Is this variable still available in php

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RTFM? http://www.php.net/getenv

Oh.. And don't rely to much on those headers.. I can put whatever I want in them :D