The problem with the calculation of the amount in the cycle, help me solve it?

Question

PHP

There is a cycle, it contains the value (int) of the array cell from the database, but with each scrolling of the cycle, the value changes, the value has the same identifier in the array [“sum”], it is necessary to add the value of the previous scrolling of the cycle with the next one. I think it is necessary to resort to an array and write the value to a separate cell of the array

Answer 1

It is better to use sum() in SQL query
Or otherwise

$sum_counter = ['total_sum' => 0];
        foreach ($few_itteartion as $itearator_key => $some_ar) {
            
            if (!isset($sum_counter['sum_for_ittaration'][$itearator_key]))
                $sum_counter['sum_for_ittaration'][$itearator_key] = 0;

            foreach ($some_ar as $v) {
                $sum_counter['total_sum'] += $v['sum'];
                $sum_counter['sum_for_ittaration'][$itearator_key]  += $v['sum'];

            }
        }