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<?php $json = '{ "group": [ { "id": "12", "value": "3" }, { "id": "15", "value": "1" } ]}'; $data = json_decode($json, true); $data['group'] = array_reduce( $data['group'], function($res, $i) { $res[$i['id']] = $i['value']; return $res; }, [] ); var_export($data); echo json_encode($data);
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