Detect the browser?

[filburt1]

if (?)
{
    echo 'You\'re using IE';
}
else
{
    echo 'You're using something else';
} 

What's the "?"

[nabeels786]

<?
if(strstr($HTTP_USER_AGENT,"MSIE")){

      print "you are using IE!<br>";
} else{
      print "you are using $HTTP_USER_AGENT<br>";
}
?>

[filburt1]

Nifty, cheers