seperate bills for $change

[mjohnson025]

Hi all, I'm having a very difficult time figuring out how to make the program determine the proper bills for this project. I've got it showing me the change, but i need to make is seperate it into 50, 20, 10, etc..  Can anyone give me an idea of where to start??

 

Thanks,

 

Mike

 

Here is what i have so far. (So nobody thinks i'm being lazy.) :-)

 

<?php
if (isset($_GET['cost']) && isset($_GET['paid'])){
   if (is_numeric($_GET['cost']) && is_numeric($_GET['paid'])){
      $cost = $_GET['cost'];
  $paid = $_GET['paid'];


$formattedCost = number_format($cost,2);
$formattedPaid = number_format($paid,2);



echo "<p>\$" . $formattedCost . "\n</p>";
echo "<p>\$" . $formattedPaid . "\n</p>";
  $change = $formattedPaid - $formattedCost;
  
  echo "<p>\$" . $change . "\n</p>";
  



   }
   else echo "<p>You must enter a numeric value!</p>";
}

?>

[akitchin]

this is just an algorithm processing downward from the highest bill amount, right up until there's no change left to give:

 

<?php
$change_rendered = array();
$bills = array(50, 20, 10, 5, 1, 0.25, 0.10, 0.05, 0.01);
foreach($bills AS $bill_amt)
{
  // how many bills of this type we need
  $num_bills = floor($change / $bill_amt);

  // add it to the change rendered array
  $change_rendered = array_merge($change_rendered, array($bill_amt => $num_bills));

  // subtract the amount from the change
  $change -= $num_bills*$bill_amt;

  // exit the loop if the change is now at 0, because we've rendered all we need to
  if ($change == 0)
    break;
}
?>

 

note that i haven't tested it, but it SHOULD work.

[mjohnson025]

reading it it looks like it should work, but something's not quite right.  I don't understand the reasoning for the array_merge. I also am not sure which variable is returning the information I need to print to the screen (50's = 1, 20's = 0, 10's = 1, etc..)

 

I really appreciate your help!

 

Mike

[DarkerAngel]

$change_rendered is the return

[Barand]

you could replace

 

$change_rendered = array_merge($change_rendered, array($bill_amt => $num_bills));

with

 

$change_rendered[$bill_amt] = $num_bills;

 

if that makes it clearer

[moon 111]

US uses $1,000 bills (and beyond I think). Just thought I should mention it. The array only has values up to $50.

[akitchin]

it was implied that the OP could adjust the array to contain all necessary bill or coin amounts available to a server.

 

if you use print_r($change_rendered), you'll get an idea of the structure of the final array and therefore you should be able to work out how to present it.

 

as for the array_merge(), i used it to avoid a notice about an undefined key; i don't know if this is avoided when one uses numerical keys (as opposed to string indexes), but barand's solution should make the line clearer as mentioned.

[mjohnson025]

thanks for everyone's help!

I really appreciate it!

 

Mike