Description:
------------
http_negotiate_language() doesn't return the default language when there are no matching languages. Oddly enough, when there is no Accept-Language header, the default language is returned, as it should. It's just that when there IS such, but it doesn't contain any matches (even partial ones), no value is returned.

Please note that the actual version I'm using is 5.2.4RC2. The whole HTTP extension doesn't seem to be loading properly in RC3 (or at least in yesterday's snapshot I tried).

Reproduce code:
---------------
<?php
$lang = http_negotiate_language(array('bg','en'),$results);
print_r($results);
echo $lang;
?>

Expected result:
----------------
With
Accept-Language: fr
header, the output should have been the same as if no header was present which from the above sample means:

Array
(
    [bg] => 1
    [en] => 1
)
bg

Actual result:
--------------
With
Accept-Language: fr
header, the output is:

Array
(
)