Generar un obj array

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Buenas, estoy empezando a trabajar con la Api de MercadoPago , pero quería hacer un intento de carrito de compras. Pero para eso primero quería generar las preferencias de los datos.

Esto es lo que tengo que generar :

Código PHP:

  $preference_data = array(
    "items" => array(
        array(
            "id" => "item-ID-1234",
            "title" => "item",
            "quantity" => 1,
            "currency_id" => "ARS", // Available currencies at: https://api.mercadopago.com/currencies
            "picture_url" => "https://www.mercadopago.com/org-img/MP3/home/logomp3.gif",
            "description" => "Item description",
            "category_id" => "art", // Available categories at https://api.mercadopago.com/item_categories
            "unit_price" => 10.00
        ),
        array(
            "id" => "item-ID-12343",
            "title" => "item2",
            "quantity" => 1,
            "currency_id" => "ARS", // Available currencies at: https://api.mercadopago.com/currencies
            "unit_price" => 10.00
        )

    ),
    "payer" => array(
        array(
            "name" => "user-name",
            "surname" => "user-surname",
            "email" => "[email protected]",
            "date_created" => "2015-06-02T12:58:41.425-04:00",
            "phone" => array(
                "area_code" => "11",
                "number" => "4444-4444"
            ),
            "identification" => array(
                "type" => "DNI",
                "number" => "12345678"
            ),
            "address" => array(
                "street_name" => "Street",
                "street_number" => 123,
                "zip_code" => "5700"
            ) 
        )
    ),
); 
   

Yo hice un intento fallido, pero cercano ... Que seria este codigo :

Código PHP:

  $general = array();
$itemstodos = (object) array( "items" => array() );
$item = (object) array(
    "id" => "item-ID-1234",
    "title" => "Multicolor kite",
    "quantity" => 1,
    "currency_id" => "ARS", // Available currencies at: https://api.mercadopago.com/currencies
    "picture_url" => "https://www.mercadopago.com/org-img/MP3/home/logomp3.gif",
    "description" => "Item description",
    "category_id" => "art", // Available categories at https://api.mercadopago.com/item_categories
    "unit_price" => 10.00
    );

$payertodos = (object) array( "payer" => array() );

$payer = (object) array(
            "name" => "user-name",
            "surname" => "user-surname",
            "email" => "[email protected]",
            "date_created" => "2015-06-02T12:58:41.425-04:00",
            "phone" => array(
                "area_code" => "11",
                "number" => "4444-4444"
            ),
            "identification" => array(
                "type" => "DNI",
                "number" => "12345678"
            ),
            "address" => array(
                "street_name" => "Street",
                "street_number" => 123,
                "zip_code" => "5700"
            ) 
        );

array_push($itemstodos->items, $item);
array_push($general, $itemstodos);
array_push($payertodos->payer, $payer);
array_push($general, $payertodos);
print_r($general); 
   

No se si alguien me puede ayudar xD o decirme una forma mas bonita de hacerlo.