CODEWITHSUNDEEP
php
JCD
JCD

Reputation: 297

PHP - Multiply two arrays but one is the quantity and one is the price

I have a form with two input fields:

Parts Price and Parts Quantity

And user can click a button to add as many as they want.

I need to calculate the parts * the quantity to get a sum. For example, if the user has Part one which is 10 dollars and has a quantity of 2. The second part is 20 dollars with the quantity of 2, the sum should be 60 dollars.

Part 1 * Quantity = sum of part 1
Part 2 * Quantity = sum of part 2
Sum of part 1 + Sum of part 2

This is a simple math equation but i get confused when it comes to arrays.

I tried the following but it only works right if the quantity is 1:

 $sumofparts = array_sum($_POST['partsprice']) * array_sum($_POST['partsquantity']);

When i try the code with a part with the price of 10 dollars and a quantity of 2 and another part is 10 dollars with the quantity of 2 the sum should be 40; however I'm getting a sum of 80

Upvotes: 0

Views: 184

Answers (1)

u_mulder
u_mulder

Reputation: 54831

Your math is wrong. What you need is to sum results of multiplying and not multiply sums. In a simple way it can be done like:

$sum = 0; 
foreach ($_POST['partsprice'] as $k => $v) {
    $sum += $v * $_POST['partsquantity'][$k];
}
echo $sum;

Upvotes: 1

Related Questions