Array
(
    [product_name] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => NAZWA produktu X
                )

            [1] => SimpleXMLElement Object
                (
                    [0] => NAZWA produktu X
                )

            [2] => SimpleXMLElement Object
                (
                    [0] => NAZWA produktu X
                )

        )

    [availability] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => brak
                )

            [1] => SimpleXMLElement Object
                (
                    [0] => brak
                )

            [2] => SimpleXMLElement Object
                (
                    [0] => brak
                )

        )

    [delivery_date] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => 2017-05-15
                )

            [1] => SimpleXMLElement Object
                (
                    [0] => 2017-07-14
                )

        )

    [reference_code] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => KOD-PRODUKTU-X
                )

            [1] => SimpleXMLElement Object
                (
                    [0] => KOD-PRODUKTU-X
                )

            [2] => SimpleXMLElement Object
                (
                    [0] => KOD-PRODUKTU-X
                )

        )

)