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@ 2018-09-16T10:34:54Z

<?php

$response = '{
               "nhif":[
                  {
                     "id_number":"AA112233",
                     "amount":"5",
                     "date":"2018-09-14T20:18:50"
                  },
                  {
                     "id_number":"AA112233",
                     "amount":"5",
                     "date":"2018-09-14T19:59:14"
                  },
                  {
                     "id_number":"AA112233",
                     "amount":"5",
                     "date":"2018-09-14T09:07:34"
                  },
                  {
                     "id_number":"AA112233",
                     "amount":"5",
                     "date":"2018-09-14T09:04:27"
                  },
                  {
                     "id_number":"12345678",
                     "amount":"5",
                     "date":"2018-09-14T09:04:21"
                  }
               ]
            }';
$json_response = json_decode($response, true);

$r = [];
foreach ($json_response['nhif'] as $nhif) {
    isset($r[$nhif['id_number']]) ? $r[$nhif['id_number']] += $nhif['amount'] : $r[$nhif['id_number']] = $nhif['amount'];
}

print_r($r);

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: Array ( [AA112233] => 20 [12345678] => 5 )

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132.52 ms | 407 KiB | 5 Q