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alibek_kz, Пробуй так ...

function on_url($id)
{
    $entry = simplexml_load_file('http://gdata.youtube.com/feeds/mobile/videos/' . $id);
    $media = $entry->children('http://search.yahoo.com/mrss/');
    if($media->group->content)
        $url = $media->group->content[1]->attributes()->url;
    else
        $url = 'Sorry, no videos were found.';
    return $url;
}

echo on_url('rcApGBwODwU').'<br />';
echo on_url('wM68SIOAMNo').'<br />';