Substract from a string

I using $_SERVER['HTTP_REFERER'] to get the referals to my site.

And I get them as
http://www.dunemaul.org/forums/viewtopic.php?t=8118
http://www.fallenheroes-guild.com/index.php
http://www.gwi.dk/Forum/viewtopic.php?t=395

I would like to store them as
http://www.dunemaul.org
http://www.fallenheroes-guild.com
http://www.gwi.dk

But I need help to how substract this.
brightwoodAsked:
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Robin HickmottConnect With a Mentor Software DeveloperCommented:
http://uk.php.net/function.parse-url

$url      =         parse_url($_SERVER['HTTP_REFERER']);
$url      =         $url['scheme'] . "://" . $url[host];
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babuno5Commented:
try using the parse url function
http://in.php.net/manual/en/function.parse-url.php
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TeRReFCommented:
If it's a whole list or URL's you have to parse, you can use this:

<?php

$s = 'http://www.dunemaul.org/forums/viewtopic.php?t=8118
http://www.fallenheroes-guild.com/index.php
http://www.gwi.dk/Forum/viewtopic.php?t=395';

preg_match_all('/.*?\/\/[^\/]+/', $s, $matches);

print_r($matches);

?>
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