我得到了这个数组：
array (
'cat' =>
array (
0 =>
array (
'name' => 'Sales',
'url' => 'http://videos.volkswagen.nl/videos/videos/',
'subs' =>
array (
0 =>
array (
'full_url' => 'http://videos.volkswagen.nl/videos/assistentiesystemen/',
'key' => 'assistentiesystemen',
'key_clean' => 'Assistentiesystemen',
'videos' =>
array (
0 =>
array (
'nice_name' => 'Multi Collision braking system',
'vid_url' => 'www.youtube.com/video/3lGfTZdVK1s',
),
1 =>
array (
'nice_name' => 'Lane Assist',
'vid_url' => 'www.youtube.com/video/II68oVm4zro',
),
2 =>
array (
'nice_name' => 'Traffic Jam Assist',
'vid_url' => 'www.youtube.com/video/tCe8Zpz8ceQ',
),
3 =>
array …