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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 git.master, git.master_jit, rfc.property-hooks: Array ( [AA112233] => 20 [12345678] => 5 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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