Modifying arrays in

I am just getting used to working with CakePHP and ran into a problem.
I am hoping someone here might know how to solve it.
I thought this was going to be an easy one but for some reason its
eluding me...

So I have an array, something like this:

[0] => Array
(
[Post] => Array
(
[id] => 1
[title] => First article
[content] => aaa
[created] => 2008-05-18 00:00:00
)
[Comment] => Array
(
[0] => Array
(
[id] => 1
[post_id] => 1
[author] => Daniel
[email] => dan@example.com
[website] => http://example.com
[comment] => First comment
[created] => 2008-05-18 00:00:00

I want to be able to add (and later remove) an element from the array.
For instance adding some extra field to the comment array.

I thought that since it is an associative array it would be pretty
easy, a foreach with something like:
$post['Comment']['test'] = 'test';
I have looked at Set::insert and it looks like it should do what I
want but I can't figure out how to get it to iterate add an element
for every comment in the array.

The end result should look like this:

[Comment] => Array
(
[0] => Array
(
[id] => 1
[post_id] => 1
[author] => Daniel
[email] => dan@example.com
[website] => http://example.com
[comment] => First comment
[created] => 2008-05-18 00:00:00
[test] => test

Anyone have any suggestions?
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