Question

This code creates an array and adds attribute ‘payment_sum’ even if $value['CardCode'] != $prevCode is false. You can see that I’m printing the values for testing, the last line with 509.85 summing correctly, but the array before that should have been omitted according to this if statement.

     if (($handle = fopen('upload/BEN-new.csv', "r")) === FALSE) {
            die('Error opening file'); 
         }

         $headers = fgetcsv($handle, 1024, ',');
         $cardCodes = array();
         $payments = array();
         $details = array ();

        while ($row = fgetcsv($handle, 1024, ",")) {
               $cardCodes[] = array_combine($headers, $row);
        }

            $prevCode = '';

            foreach ($cardCodes as $key => $value) {

                if ($value['CardCode'] != $prevCode) {
                    $payments['payment_sum'] = $value['InvPayAmnt'];
                }
                else {
                    $payments['payment_sum'] += $value['InvPayAmnt'];
                }

                    $prevCode = $value['CardCode'];
                    print_r ($payments);
            }
            fclose($handle);

Printing…

   Array
     (
         [payment_sum] => 1055.40
     )

   Array
   (
         [payment_sum] => 550.00
   )

   Array
   (
         [payment_sum] => 100.00
    )

   Array
   (
        [payment_sum] => 287.33
   )
   Array
   (
       [payment_sum] => 509.85
   )

Preferred Output

   Array
     (
         [payment_sum] => 1055.40
     )

   Array
   (
         [payment_sum] => 550.00
   )

   Array
   (
         [payment_sum] => 100.00
    )

   Array
   (
       [payment_sum] => 509.85

         Array (
                  [currTotal] =>  287.33
                  [currTotal] =>  222.52
               )
   )

CSV

  BENV1072      1055.4
  BENV1073      550
  BENV5271      100
  BENV5635      287.33
  BENV5635      222.52

Answer 1

Each time through the for loop you either set $payments['payment_sum'] to the current row’s payment ($value['InvPayAmnt']) or you add the row’s payment to the total. Since the previous code is different from the current row’s code for all but the final row, you’re overwriting the running total over and over. Only the last row is added to the previous row’s payment, giving 509.85 as the result.

You are treating $payments as a single-value variable rather than an array because the key under which you store the totals never changes. You need to use the vendor ID as the key.

$payments = array();
foreach ($cardCodes as $key => $value) {
    $payments[$value['CardCode']] += $value['InvPayAmnt'];
}
print_r($payments);

Output

Array
(
    [BENV1072] => 1055.4
    [BENV1073] => 550
    [BENV5271] => 100
    [BENV5635] => 509.85
)

You can easily have the $payments array track the individual payments from the file as well as the total.

$payments = array();
foreach ($cardCodes as $key => $value) {
    $payments[$value['CardCode']]['payments'][] = $value['InvPayAmnt'];
    $payments[$value['CardCode']]['total'] += $value['InvPayAmnt'];
}
print_r($payments);