multidimensional array array_sum

Question

I have seen various posted about this question so am aware some answers to this may exist. however I am none the wiser after reading these.

I have an array that is

Answer 1

Just another way to do this using array_reduce:

$vatMount = array_reduce($account_invoices, function($total, $value) {
    return $total + $value['vatAmount'];
});