Php cek pengunjung blog atau wap

<?php
/*
Php cek pengunjung blog/wap
*/
$tesvisitor=fopen('tes-visitor.txt','a');
fwrite($tesvisitor,"\n==================================================================================================================\nIp: ".$_SERVER['REMOTE_ADDR']."\nWaktu: ".date('l/h:i:s/Y-m-d')."\nReferrer: ".$_SERVER['HTTP_REFERER']."\nUser agent: ".$_SERVER['HTTP_USER_AGENT']);
fclose($tesvisitor);
?>