Question

I’ve this simple form, when the price is set to 120 $:

  <input type="checkbox" name="addon[book]" value="120" /> book
  <input type="checkbox" name="addon[plane]" value="420" /> Plane

Could I send two values (USD & €) with thr form?

EDIT:

I added name="addon[book]" because I’ll display the name too

EDIT 2:

PHP:

foreach($addon as $name => $value) {
    echo 'your addons: '.$name;
}
$total = array_sum(array_map("intval", $_POST["addon"]));
echo 'the total '.$total.' $'; 

Answer 1

<input type="hidden" name="addon[book_USD]" value="250" />
<input type="checkbox" name="addon[book_EUR]" value="120" /> book

However NEVER trust the input from the form. Check the price in the backend code or users can change the price!

EDIT

What about json encoding?

<input type="checkbox" name="addon[book]" value="{&quot;USD&quot;:250,&quot;EUR&quot;:120}" /> book

EDIT2

To explode the values you’ll have to use json_decode()

EDIT3

As others (and myself) already stated what you are trying to do (at least from the looks of it) is that you use the price from the input field as the price the user is going to pay.

That is not the best thing you can do, cause users can easily change the price of the input field.

I don’t know your code but somehting like the following would be much better:

<input type="checkbox" name="addon[book]" value="book1">

And in your PHP code:

$prices = array('book1'=>array('USD'=>250, 'EUR'=>120),
                'book2'=>array('USD'=>120, 'EUR'=>60),
);