Get Site Root

I'm creating a link echange script for one of my sites, when validating the link has been placed on their site I want to check the hompage/root of the site for a link.

If they give me a url such as: http://mysite.com/abc/ssds/page.php


Is there anyway in php to just get the root: http://mysite.com/

Without using a stripping function?

Thanks

 

$url = "http://mysite.com/abc/ssds/page.php";
$n = parse_url($url);
echo $n['host'];

 

Thanks that's perfect!