Online PHP editor | refs for 9XKFO

<?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);