Store object into array and group all array with the same value in PHP

Collection function might help you find your solution.

$json = '{"data":{"id":2,"title":"second evaluation form","emp_position":"System Architecture","rating":5,"segments":[{"segment_name":"Job Role ","question":"How old are you?"},{"segment_name":"360 Segments","question":"What is your food?"},{"segment_name":"360 Segments","question":"sample question"}]}}';    $array = json_decode($json, true);    $coll = collect($array['data']['segments']);    $coll = $coll->groupBy('segment_name');    dump($coll);

Hope this helps you.Let me know if any problem

Do it like below:-

<?php$json = '{        "data": {            "id": 2,            "title": "second evaluation form",            "emp_position": "System Architecture",            "rating": 5,            "segments": [                {                    "segment_name": "Job Role ",                    "id": 4,                    "question": "How old are you?"                },                {                    "segment_name": "360 Segments",                    "id": 1,                    "question": "What is your food?"                },                {                    "segment_name": "360 Segments",                    "id": 2,                    "question": "sample question"                }            ]        }    }';$query = json_decode($json,true);$segment_array = [];foreach($query['data']['segments'] as $arr){  $segment_array[$arr['segment_name']]['segment_name'] = $arr['segment_name'];  $segment_array[$arr['segment_name']]['question_collection'][] = ['id'=>$arr['id'],'question'=>$arr['question']] ;}$query['data']['segments'] = array_values($segment_array);echo json_encode($query,JSON_PRETTY_PRINT);

OUTPUT:- https://eval.in/902194

Try this solution, You can loop by array and group all keys

$json = '{        "data": {            "id": 2,            "title": "second evaluation form",            "emp_position": "System Architecture",            "rating": 5,            "segments": [                {                    "segment_name": "Job Role ",                    "question": "How old are you?"                },                {                    "segment_name": "360 Segments",                    "question": "What is your food?"                },                {                    "segment_name": "360 Segments",                    "question": "sample question"                }            ]        }    }';$data = json_decode($json,true);$segments = $data['data']['segments'];$new_segemnts = array();foreach($segments as $segemnt){    $key = $segemnt['segment_name'];    $new_segemnts[$key]['segment_name']=$segemnt['segment_name'];    $new_segemnts[$key]['question_collection'][]=array("question"=>$segemnt['question']);}$data['data']['segments'] = array_values($new_segemnts);echo json_encode($data,JSON_PRETTY_PRINT);

DEMO