youtube oembed request return empty

guys pls. help me. my brain is bursting with this one.
oembed of youtube returns empty, oembeds of dailymotion, vimeo and others works great. but for youtube it returns empty.

and after i investigate further. even when you put simple codes (to eliminate more stuff), so the problem is youtube request is blocked?

$xml=simplexml_load_file(‘http://www.dailymotion.com/services/oembed?format=xml&url=http://www.dailymotion.com/video/xoxulz_babysitter_animals’);

$xml2 = simplexml_load_file(“http://www.youtube.com/oembed?url=http%3A//www.youtube.com/watch?v%3D-UUx10KOWIE&format=xml”);

when you echo $xml2->html;
it is empty.

the request gets blocked, or not sent tru youtube.

likewise with the json option.

please help me guys. pls. pls. im stressed by this for almost 48 hours. need to launch the site. pls. pls. great thanks . 🙂