How can i use variable from diffrent foreach to get value by adding 2 variable itself

Hello guys, now i have little problem that spend my time not to hard but don't know how to solved this, here is my view

Code:

<?php
foreach ($sum->result() as $row) {  ?>

$untung=$row->jumlah_item;

<?php  }  ?>



<?php
foreach ($sumongkir->result() as $row) {  ?>

$ongkir=($row->total);

<?php  }  ?>


$total=$untung+$ongkir; //it doesn't working, what do i wrong here? please guide me to debug it, thanks

Assume two query result in the same size

PHP Code:

// assume $sum->num_rows() == $sumongkir->num_rows()
for ($i = 0; $i < $sum->num_rows(); ++$i) {
    $untung=$sum->row($i)->jumlah_item;
    $ongkir=$sumongkir->row($i)->total;
    $total+=$untung+$ongkir;    
} 


Not sure I understand your question correctly but I think $total may be an array $total[$i]