PHP help...HTTP_REFERER

Ok, once again I am completely stumped.

Im sure someone can answer this pretty easily - but for some reason I am having major issues.

Here is the code:

session_start();

include_once "folder/connect_to_mysql.php";

$ref = parse_url($_SERVER['HTTP_REFERER']);

$host = $ref["host"];

if ($host != "www.(my site here).com") {

          echo "Crap! Something broke on the backend...";

          exit();

}

needless to say, it always echos out the "Crap! Something broke on the backend..."

I cannot figure out why though.

Any ideas?