elucidate structure of unknown array

[Usagi]

I have an array and I cannot figure out it's structure so I can work in it.

It comes from decoding a torrent, specifically it is the announce-list.

I've tried announce-list[1] and it returns "array"

if I try announce-list[1][1] I get n a null value.
same with [1][2] etc.

How can I figure out the structure of this array?

Usagi

[thorpe]

print_r($array);