How do I access this PHP array?

Question

I have an array and if I write the code:

echo $itemsub['addon_name_trans']

then I get:

Array

and if I write the code:

print_r($itemsub['addon_name_trans'])

then I get

Array ( [sub_item_name_trans] => Array ( [1] => content ) )

How do I access this array so it just says content?

I tried echo $itemsub['addon_name_trans']['sub_item_name_trans'] and echo $itemsub['addon_name_trans']['0'] but neither worked.