PHP Sessions购物车：如果产品已经是会话，则更新产品

Question

I have struggled to find a solution to a simple shopping cart with $_SESSION. I kept it very simple and this is my code right now

if ( Input::isPost('add') ) {

    $id = Input::get('id');
    $qta = Input::post('qta');
    $size = Input::post('size');

    if ( !isset($_SESSION['cart']) ) {
        $_SESSION['cart'] = array();
    }

    if ( array_key_exists($id, $_SESSION['cart']) ) {
        if ( $_SESSION['cart'][$id][0] == $size ) {
            $_SESSION['cart'][$id][1]+=$qta;
        } else {
            $_SESSION['cart'][$id] = array( $size, $qta );
        }
    } else {
        $_SESSION['cart'][$id] = array( $size, $qta );
    }

}

So, what this code does ?

1) If the $_SESSION['cart'] does not exist, create it, otherwise add the new item. 2)When you add to cart a item, you must choose a size and a quantity for that item. 3) If that item already exists in the cart array, check if the size is the same, if so just update the quantity. Here is the problem, if the item already exists(checks for the $_SESSION['cart'][$id]) BUT the size is different, do not update the current one, but instead create a new item. The problem is that the current one is being replaced instead of adding one, so instead of 2 products with the same id but different size, I only have the most recent one.

If you could help me solve it I'll be very thankful !

Thank you in advance.

Answer 1

Try using the size as a key to an extra dimension in your multidimensional array. Your current code only allows you to have one size per item.

You would end up with something like:

if ( Input::isPost('add') ) {

    $id = Input::get('id');
    $qta = Input::post('qta');
    $size = Input::post('size');

    if ( !isset($_SESSION['cart']) ) {
        $_SESSION['cart'] = array();
    }

    if ( array_key_exists($_SESSION['cart'][$id][$size]) ) {
        $_SESSION['cart'][$id][$size] += $qta;
    } else {
        $_SESSION['cart'][$id][$size] = $qta;
    }
}