使用Stripe中返回的对象/列表

I have a Stripe_List that is returned from a \Stripe_InvoiceItem::all() request.

$invoice_items = \Stripe_InvoiceItem::all();
return $invoice_items;

This gives me the following:

Stripe_List JSON: {
    "object": "list",
    "has_more": false,
    "url": "\/v1\/invoiceitems",
    "data": [
        {
            "id": "ii_123456789abcdefg",
            "object": "invoiceitem",
            "date": 1424714643,
            "amount": 0,
            "livemode": false,
            "proration": false,
            "currency": "gbp",
            "customer": "cus_xyz12345",
            "description": "Invoice Item",
            "metadata": [],
            "invoice": "in_abcdefghijklmnop",
            "subscription": null,
            "quantity": null,
            "plan": null
        }
    ]
}

But, I'm unsure how to loop through the results.

return $invoice_items->data; // returns [{}]
return $invoice_items->data(); // Call to undefined method Stripe_List::data()
return $invoice_items->get('data'); // returns Call to undefined method Stripe_List::get()
return json_decode($invoice_items); // returns empty string

I think its just a major gap in my fundamental php knowledge, but after a lot of googling I'm struggling to find any answers.

$invoice_items->data should be what you want. It may not be rendering the string preview properly. If you print $invoice_items->data[0] do you get the correct object?