Debug: cart Object
(
    [id] => 1
    [user] => user Object
        (
            [id] => 1
            [firstname] => Michael
            [name] => Haussmann
            [mail] => michael@phpersistence.org
            [telephones] => Array
                (
                    [0] => 04 67 54 55 xx
                    [1] => 06 11 73 43 xx
                )

        )

    [products] => Array
        (
            [0] => wine Object
                (
                    [id] => 1
                    [name] => Chateau Moulin à vin
                    [description] => très bon
                    [price] => 25.00
                    [millesime] => 1998
                    [AOC] => Bordeaux
                )

            [1] => 
        )

    [date] => 1527020510
)