multidimensional array merge into one array if key is same without using nested loop


    [
      {
        "status": true,
        "data": [
          {
            "id": 2,
            "name": "Algeria",
            "country_code": "DZ",
            "regions": [
              {
                "id": 2,
                "country_id": 2,
                "region_code": "RG01",
                "depots": [
                  {
                    "id": 5,
                    "region_id": 2,
                    "depot_code": "DP04",
                    "depot_name": "North Depot",
                    "area": [
                      {
                        "id": 1,
                        "depot_id": 5,
                        "area_code": "AR1",
                        "area_name": "Area-1"
                      },
                      {
                        "id": 2,
                        "depot_id": 5,
                        "area_code": "AR2",
                        "area_name": "Area-2"
                      }
                    ]
                  },
                  {
                    "id": 6,
                    "region_id": 2,
                    "depot_code": "DP06",
                    "depot_name": "east Depot",
                    "area": [
                      {
                        "id": 3,
                        "depot_id": 6,
                        "area_code": "AR3",
                        "area_name": "Area-3"
                      }
                    ]
                  }
                ]
              },
              {
                "id": 3,
                "country_id": 2,
                "region_code": "RG02",
                "depots": []
              }
            ]
          }
        ]
      }
    ]

i want to merge area into single array like


    "area": [
      {
        "id": 1,
        "depot_id": 5,
        "area_code": "AR1",
        "area_name": "Area-1"
      },
      {
        "id": 2,
        "depot_id": 5,
        "area_code": "AR2",
        "area_name": "Area-2"
      },
      {
        "id": 3,
        "depot_id": 6,
        "area_code": "AR3",
        "area_name": "Area-3"
      }
    ]

i don’t want to use multiple foreach. thanks in advance.

Answer

You can use the following code to recursively iterate of all your structure and extract only data you need (by key). I assume $data has your original data structure and within $result you will get array of area:

$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($data), RecursiveIteratorIterator::SELF_FIRST);

$result = [];
foreach ($it as $k => $v) {
    if ($k === 'area') {
        $result = array_merge($result, $v);
    }
}

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Answer