Get Youtube title from video ID

http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=' . $ref . '&format=json

Ví dụ

https://www.youtube.com/watch?v=DZDYZ9nRHfU

Ta có link:
http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=DZDYZ9nRHfU&format=json