On server I am returning an array after some operations. I want to work with this array after the Ajax call succeeds.

```
var addPaymentType = function(){
    var data = new Object()
    data["function"]        = "add";
    data["payment_type_id"] = $("#payment_types").val();
    data["data"]            = $("#saveform").serializeArray();
    $.ajax({
        type: "POST",
        url: location.href,
        data: data,
        dataType: "JSON",
        success : function (data)
        {
            console.debug(data['plan_pt_id']);
        }
    });
};

```

But `data['plan_pt_id']` is `undefined`. If I return not an array, all works pretty. But how can I work with array?

Thank you.