find unique visitors php

How to find traffic and unique visitors to trying to find a general number on traffic and unique helps me find traffic/unique visitors for website. Just how "unique" are unique visitors? how closely does the number of unique visitors correlate to "people?". Greetings, i have a php site and i was wondering how i can display a count of the total number of visitors currently viewing my website. thanks.

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Currently i have a file called "hits.php" and on any page i want to track page hits i just use <?php include("hits.php"); ?> how can i track unique visitors only though?. Web visitor counter that counts the unique visitors for a web page. this script counts only unique visitors based on the visitor's ip-address. this php script works. As the title says; what is the difference between visitor and unique visitor? a visitor is a user with a cookie for one browser, as long as that cookie is valid, isn.