browser detect

[crissrusso]

the thing is to do 1 index.php wich detects browster Firefox and IE7 to redirekt it in http://examples.com/ , if it detects IE6 let it go directly to that saves code in examples.html Sample
how can i do it?

<?
$filename = "examples.html";
$realfile = "examples.html";
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$filename.";");
@readfile($realfile);
$counter = file_get_contents("examples");
(int)$counter++;
$fp=fopen("examples", "w");
fwrite($fp,$counter);
fclose($fp);
?>

[phper]

You should have a look on the PHP site:

http://us3.php.net/function.get-browser

http://uk.php.net/manual/en/reserved.variables.server.php