PHP serializing array as object in JSON [duplicate]

Question

I'm trying to call a REST endpoint that is expecting an object with an array 'campaigns' and a boolean 'getChildren'. The issue is that the array is sometimes serialized as an object instead of an array.

The incorrect request I'm getting :

   {
    "campaigns":
      {
        "1":"1006352",
        "2":"1006347",
        "3":"1006350",
        "4":"1006349",
        "5":"1006348",
        "6":"1006345",
        "7":"1006344",
        "8":"1006343"
       },
    "getChildren":false
   }

What I want (and that I get sometimes) :

 {
  "campaigns":["1006351","1006346"],
  "getChildren":false
 }

Here is my code :


            $campaignIds = array_map(function ($item) use ($networkIds) {
            return $item->nid;
        },
            array_filter($items, function ($item) use ($networkIds) {
                return empty((int)$item->nb_shared);
            }));

        $consoWithoutChildren = EndpointClient::getConsumptionByCampaign($networkIds, $campaignIds);

I want the 'campaigns' parameter to be always interpreted as an array.

I tried json_encode() but it escapes the array, causing issues in the use cases where I had valid JSON, like that :

{"campaigns":"[\"1006351\",\"1006346\"]","getChildren":false}

Any idea what is wrong ?

You need to extract and provide a minimal reproducible example. In particular it's unclear how you come to the conclusion that json_encode() escapes an array in any way. Also, nobody here knows what happens in the other parts of your program or what e.g. $networkIds is. — Ulrich Eckhardt
– Ulrich Eckhardt, Commented Feb 10, 2020 at 10:23

Thomas Martin · Accepted Answer · 2020-02-10 10:28:02Z

array_filter keeps the index of the array elements. So if the first element of your array does not fulfill the condition of your array_filter, you have no element at the 0 index. To be serialized properly, the array must not have null values in it.

The solution is to reassign the array elements to 0 to n index, with array_values().

Like this :

        // array_values is needed to have arrays' indices beginning at 0.
        // If not, the JSON parsing would consider the array an object.
        // Like {"campaigns":{"1":"1006352","2":"1006347"}}
        $campaignIds = array_values(
            array_map(
                function ($item) use ($networkIds) {
                    return $item->nid;
                },
                array_filter(
                    $items,
                    function ($item) use ($networkIds) {
                        return empty((int)$item->nb_shared);
                    }
                )
            )
        );

        $consoWithoutChildren = EndpointClient::getConsumptionByCampaign($networkIds, $campaignIds);

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