changing output based on http_host?

So I am trying to do something like this…

?php 
switch($_SERVER['HTTP_HOST']) {
    case 'wahsingtonbasedsite.com':
    case 'www.washingtonbasedsite.com':
        echo 'WASHINGTON PHONE NUMBER';
    break;
    case 'idahobasedsite.com':
    case 'www.idahobasedsite.com':
        echo 'IDAHO PHONE NUMBER';
    break;
    default:
        echo 'DEFAULT PHONE NUMBER';
    break;

?>

But all I keep getting is nothing shown, if anyone has any ideas that would superb. Thank you for your time!

Chad