How to sum array value of duplicate data

Question

I have an array with some of same ID value as shown in below.

[
    {\"ID\":\"126871\",\"total\":\"200.00\",\"currency\":\"USD\",\"name\":\"John         


        

Answer 1

What: Create an array that is grouped by 'ID' and 'Currency'. Accumulate currency for duplicates.

How:

• Add rows one at a time to an output array.
• If group is not in the array then add it
• If it is in the array then add the currency to the existing record.

Demonstration at eval.in

Code:

/** ----------------------------------------------
* Create an output array one row at a time.
* 
* Group by Id and currency.   
* 
* @param array $groups
* 
* @return array
*/
function getCurrencyGroups(array $groups)
{
    $currencyGroups = array();

    foreach ($groups as $item) {

        $id       = $item['ID'];
        $currency = $item['currency'];
        $amount   = $item['total'];

        if (!isset($currencyGroups[$id][$currency])) {
            $currencyGroups[$id][$currency] = $amount;
        }
        else {
            $currencyGroups[$id][$currency] += $amount;
        }
    }

    return $currencyGroups;
}

Run it:

$currencyGroups = getCurrencyGroups($source);

Output:

array (size=2)
  126871 => 
    array (size=1)
      'USD' => string '200.00' (length=6)

  126872 => 
    array (size=2)
      'Euro' => float 4000
      'USD' => string '500.00' (length=6)