How to change json array?

Question

PHP

Good day to all, there is a json array of type

"group": [
                {
 "id": "12",
"value": "3"
},
       {
"id": "15",
"value": "1"
}
 ]

How can I get the array to become like this (PHP)

"group": 
            {
            "12": "3",
             "15": "1"
            }

Answer 1

Parse -> modify -> assemble

Answer 2

Don't thank:

$data = json_decode($json, true);

$data['group'] = array_reduce(
  $data['group'],
  function($res, $i) {
    $res[$i['id']] = $i['value'];
    return $res;
  },
  []
);

PHP online
Result:{"group":{"12":"3","15":"1"}}

Answer 3

json_decode/array_column/json_encode