PHP Assotiative array -> recursive traverse not working

Question

I have an associative array object :

   [ {
      "id": 15,
      "owner_id": 1,
      "container_info": {
        "id": 1,
        "container_id": 15
      },
      "filters": [
        {
          "id": 3,
          "parent_id": null
        },
        {
          "id": 6,
          "parent_id": null
        }
      ],
      "children_recursive": [
        {
          "id": 7,
          "owner_id": 1,
          "container_info": null,
          "filters": [

          ],
          "children_recursive": [
            {
              "id": 8,
              "owner_id": 1,
              "container_info": null,
              "filters": [

              ],
              "children_recursive": [

              ]
            }
          ]
        },
        {
          "id": 16,
          "owner_id": 1,
          "container_info": {
            "id": 2,
            "container_id": 16
          },
          "filters": [

          ],
          "children_recursive": [

          ]
        },

      ]
    }
   ]

I want to recursively loop through all object and their children_recursive key. And each children_recursive object (at any depth) needs to be processed

So I used :

public function traverseContainerRecursively($containerItems)
    {


            Log:info(' CHECK 1');
              foreach ($containerItems as $containerItem) {

                Log::info(json_encode($containerItem->id));                    
                Log::info(json_encode($containerItem->owner_id));                    
                Log::info(json_encode($containerItem->container_info));
                Log::info(json_encode($containerItem->children_recursive));

              }


              Log::info(' CHECK 2');
              foreach ($containerItems as $containerItem) {

                Log::info(json_encode($containerItem['id']));
                Log::info(json_encode($containerItem['owner_id']));
             Log::info(json_encode($containerItem['container_info']));
         Log::info(json_encode($containerItem['children_recursive']));
              }

            Log::info(' CHECK 3');

            foreach ($containerItems as $key=>$value) {

                    if( $key == "children_recursive" ) {

                            Log::info(json_encode($value));
                            $this->traverseContainerRecursively($value);
                    }

            } //foreach end

    }

OUTPUT :

CHECK 1 
15
1
null
null


CHECK 2 
15
1
null
null

CHECK 3

{
  "id": 15,
  "owner_id": 1,
  "container_info": {
    "id": 1,
    "container_id": 15
  },
  "filters": [
    {
      "id": 3,
      "parent_id": null
    },
    {
      "id": 6,
      "parent_id": null
    }
  ],
  "children_recursive": [
    {
      "id": 7,
      "owner_id": 1,
      "container_info": null,
      "filters": [

      ],
      "children_recursive": [
        {
          "id": 8,
          "owner_id": 1,
          "container_info": null,
          "filters": [

          ],
          "children_recursive": [

          ]
        }
      ]
    },
    {
      "id": 16,
      "owner_id": 1,
      "container_info": {
        "id": 2,
        "container_id": 16
      },
      "filters": [

      ],
      "children_recursive": [

      ]
    },

  ]
} // i.e. the entire passed object

So I am unable to retrieve the value for key "children_recursive". Please guide.

try with in the if as $value->children_recursive == "children_recursive" — Rama Durai
– Rama Durai, Commented Nov 11, 2016 at 7:56
not working.. it gives error : ErrorException: Trying to get property of non-object — cosmoloc
– cosmoloc, Commented Nov 11, 2016 at 8:10
try with in the if as $value['children_recursive'] in Log::info() — Rama Durai
– Rama Durai, Commented Nov 11, 2016 at 8:19

cosmoloc · Accepted Answer · 2016-11-11 09:38:20Z

1

I figured out the issue.

Following code worked:

$obj = json_decode($containerItem);
Log::info(json_encode($obj->children_recursive));

answered Nov 11, 2016 at 9:38

cosmoloc

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