如何在php和mysql中做乘法

Question

I need to multiply the price by the quantity to get the total cost but i am not sure how to do this.

This is what i have done so far:

<?php do { ?>
    <p align="Center"> 
        <?php echo $row3['unitprice'] ?> 
        <?php echo $row3['quantity']; ?>
    </p>
<?php } while ($row3 = mysqli_fetch_assoc($resultCustomer3))?>

at the moment i am only printing out unit price and the quantity.

how would i multiply the two to get the total?

HELP please!!

Answer 1

Try this

<?php  while ($row3 = mysqli_fetch_assoc($resultCustomer3)) {?>
<p align="Center"> 
    <?php echo $row3['unitprice']; ?> 
    <?php echo $row3['quantity']; ?>
    <?php echo $row3['quantity']*$row3['unitprice']; ?>
</p>
<?php } ?>

Answer 2

To multiply two fields in php, you need this code:

$total = $mnth_190 * $rate_190;

After having calculated the result, you can normally output the variable total !