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

Also you can do this (if you like array_sum function):

foreach($account_invoices as $num => $values) {
    $vatAmount[] = $values[ 'vatAmount' ];
}

$Total = array_sum($vatAmount);