I am having trouble trying to echo each iteration of a particular part of an array.

Here are the clues. I can't quite piece them together (since I don't yet know much about php arrays).

If I do the following:

I get the URL of the file, which is what I want. However, I have four different URL's (A "two-dimensional array", I believe?), and I want to echo each of them.

According to the Simple Fields documentation, I know that I need to change the second line to:

$audiofile = simple_fields_values("audiofile");

This leads me to change the php as follows:

But this only echoes "ArrayArrayArrayArray".

Which makes sense, because $audiofile is returning an array of info, FROM WHICH I only want the ['url'].

So, I tried the following:

But that echoes null.

Any ideas?