Calculate the total price from a foreach generated table in php - php

Question

I have the following php/html code :
<div id="demo">
<table cellpadding="0" cellspacing="0" border="0" class="display" id="example">
<thead>
<tr>
<th>Medicine Name</th>
<th>Batch Number</th>
<th>Total Quantity</th>
<th>Expiry Date(s)</th>
<th>Selling Price</th>
<th> Total Price</th>
<th>Issue</th>
</tr>
</thead>
<tbody>
<?php foreach ($prescription as $prescribed): ?>
<tr class="odd gradeX">
<td><?php echo $prescribed['commodity_name']; ?></td>
<td ><?php echo $prescribed['batch_no']; ?></td>
<td><?php echo $prescribed['total_quantity']; ?></td>
<td><?php echo $prescribed['expiry_date']; ?></td>
<td ><?php echo $prescribed['selling_price']; ?></td>
<td><?php
$total_quantity = $prescribed['total_quantity'];
$selling_price = $prescribed['selling_price'];
$total_quantity_float = floatval($total_quantity);
$selling_price_float = floatval($selling_price);
$total_price = $total_quantity_float*$selling_price_float;
echo $total_price;
?></td>
<td>
<a class="issue" href="#types" id="issue">Issue</a>
<input type="hidden" name="batch_no" id="batch_no" value="<?php echo $prescribed['batch_no']; ?>"/>
</td>
<!-- <td> <a id="issue1" class="issue1" href="#types">Issue</a> </td>-->
</tr>
<?php endforeach; ?>
</tbody>
</table>
</div>
I would like to get the total sum of the total_price variable which is displayed(total_price variable) as a row on the table. This should show the total price for all the commodities, how can I do this best?

Answer 1

try this
<?php
$total_price_sum = 0;
foreach ($prescription as $prescribed){
..
..
$total_price_sum = $total_price_sum + $total_price;
}
echo $total_price_sum;
?>

Answer 2

You can do this by adding to a variable each time you loop. This can be done as follows:
<?php
$grand_total = 0;
foreach ($prescription as $prescribed){
?>
..... all the HTML bits .....
<?
$grand_total = $grand_total + $total_price;
}
echo $grand_total;
?>
Hope that helps.
Regards,
Ralfe