multiply 2 values from different table using codeigniter and postgresql foreach() - php

Question

Here's the code from my
Controller Page
public function table1(){
$this->load->model('test_model');
$data['value']= $this->test_model->getAlltable1();
$data['value2']= $this->test_model->getAlltable0();
$this->load->view('table1', $data);
}
Views Page
<table class="table">
<tbody>
<?php foreach ($value as $v){ ?>
<?php foreach ($value2 as $v2){ ?> //different table
<tr>
<td><?php echo $v->tech_voc?></td>
<td><?php echo ($v->tech_voc*$v2->tech_voc)?></td>
</tr>
<?php } ?>
<?php } ?>
The output is somewhat like this
1 .75
1 .75
1 .75
1 .75
What I want to display is something like this
1 .75
What happen here is that, instead it multiply once, it all multiply each row. And I think it is because I put foreach inside a foreach Please help me.
EDIT
Oh yeah, I already tried deleting the foreach value2
but it says v2 is undefined variable
HOPE it helps.
NEW EDIT:---------------------------------------

Answer 1

If you're trying to multiply where the keys are the same ($value[0]*$value2[0], $value[1]*$value2[1], etc) try this.
<?php
$col1_sum = 0;
$col2_sum = 0;
foreach ($value as $k => $v){ ?>
<tr>
<td><?php echo $v->tech_voc?></td>
<td><?php echo ($v->tech_voc*$value2[$k]->tech_voc)?></td>
<?php //update sums
$col1_sum += $v->tech_voc;
$col2_sum += ($v->tech_voc*$value2[$k]->tech_voc);
?>
</tr>
<?php } ?>
<!-- row with sums -->
<tr>
<td><?php echo $col1_sum?></td>
<td><?php echo $col2_sum?></td>
</tr>
Edited based on comments/chat to include a sum row.