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<?php
if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE?8.0"))??
echo?"Internet?Explorer?8.0";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE?7.0"))??
echo?"Internet?Explorer?7.0";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE?6.0"))??
echo?"Internet?Explorer?6.0";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"Firefox/3"))??
echo?"Firefox?3";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"Firefox/2"))??
echo?"Firefox?2";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"Chrome"))??
echo?"Google?Chrome";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"Safari"))??
echo?"Safari";??
else?if(strpos($_SERVER["HTTP_USER_AGENT"],"Opera"))??
echo?"Opera";??
else?echo?$_SERVER["HTTP_USER_AGENT"];??
?>

That’s it.