如何使用jQuery .ajax（）将非序列化数据转换为php数组

Array
(
    [infos] => address=&phone=&mail=
    [products] => Product0=C&Product1=B&Product2=A&Produic3=C
)

Above is what I managed to get in php using this javascript:

var $products = $("#selectProducts").find("input");
var serializedProducts = $products.serialize();

request = $.ajax({
    url: "backend.php",
    type: "post",
    data: {
        infos: serializedData,
        products: serializedProducts
    }
});

I have tried unserialize(), but it sends an error. Also, [Product0], [Product1], etc are <input> names and A, B, C are <input> values. I do not know how much of these <input> will be sent to the php, it's up to the user.

And here's what I would like to get in Php (or as close to this as possible) :

Array
(
    [infos] => address=&phone=&mail=
    [products] => Array (
                          [Product0] => C
                          [Product1] => B
                          [Product2] => A
                          [Product3] => C
                  )
)

I just can't figure how to create the corresponding javascript object.