PHP/HTML/HTTP REFERER

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HTTP_REFERER and HTTP_USER_AGENT

   <source lang="html4strict">

<?php

           if (isset($_SERVER["HTTP_REFERER"])) {
                   print "The page you were on previously was {$_SERVER["HTTP_REFERER"]}
"; } else { print "You didn"t click any links to get here
"; }  ?> <a href="refer.php">Click me!</a> </source>