php referer is empty

Hi all,

I want to trace which sites (google, yahoo...) refers to my site. I am using $_SERVER["HTTP_REFERER"] but I get an empty string.

I am using the code below at my home page.
$ref=$_SERVER["HTTP_REFERER"];

I search my site in yahoo and google then click on the result list but I got an empty string. How can I deal with it? Should i configure something on php.ini?


Thanks.
sdiekenAsked:
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Muhammad WasifCommented:
If you have installed zone alarm on your pc, then you will get  $_SERVER["HTTP_REFERER"] empty.

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sdiekenAuthor Commented:
Oh! do you know where I can get a free php script for tracking my site ( referer, keyword rate...)?
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