Browser content
$viewer = getenv( "HTTP_USER_AGENT" );
$browser = "an unidentified browser";
if( preg_match( "/MSIE/i", "$viewer")){ $browser = "Internet Explorer"; }
else if( preg_match( "/Netscape/i", "$viewer"))
{ $browser = "Netscape"; }
else if( preg_match( "/Opera/i", "$viewer"))
{ $browser = "Opera"; }
$platform = "an unidentified operating system";
if( preg_match( "/Windows/i", "$viewer"))
{ $platform = "Windows"; }
else if( preg_match( "/Linux/i", "$viewer"))
{ $platform = "Linux"; }
echo( "You're using $browser on $platform" );
?>