Description:
------------
PHP 5.3.2 (cli)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with Xdebug v2.0.5, Copyright (c) 2002-2008, by Derick Rethans


FILTER_VAR returns false on valid URL's such "http://www.sky-bizz.com".
Without minus-sign it will return the string as positive result.

In Bug-Search I found the hint, that it already would be fixed in 5.2.13.
It seems, that in 5.3.2 this bug was born again 

Test script:
---------------
$url = "http://www.sky-bizz.com";
var_dump(filter_var($url, FILTER_VALIDATE_URL));


Expected result:
----------------
string "http://www.sky-bizz.com"

Actual result:
--------------
bool (false)