如何取消设置$ _SESSION数组中的项目

问题描述：

i have 2 functions. First one is adding item to cart, second should delete specific item based on product id.

function AddToCart($pid) {
    if (isset($_SESSION['products']['prod_count'])) {
        $_SESSION['products']['prod_count'] ++;
        $incart = $_SESSION['products']['prod_count'];
        $_SESSION['products'][$incart]['product_id'] = $pid;
    } else {
        $_SESSION['products']['prod_count'] = 0;
        $incart = $_SESSION['products']['prod_count'];
        $_SESSION['products'][$incart]['product_id'] = $pid;
    }
}

function DeleteProduct($pid) {
    foreach ($_SESSION['products'] as $key => $my_value) {
        foreach ($my_value as $key => $product_id) {
            if ($product_id == $pid) {
                // do not know how to unset this product
            }
        }
    }
}

I need some idea on how to unset the product if $product_id == $pid or may be some other ideas how to achieve that.

My array look something like:

array(1) { ["products"]=> &array(4) 
                { ["prod_count"]=> int(2) 
                           [0]=> array(1) { ["product_id"]=> int(4)}
                           [1]=> array(1) { ["product_id"]=> int(10) } 
                           [2]=> array(1) { ["product_id"]=> int(11) } } }

答

The following code would simply solve your problem:

    function DeleteProduct($pid) {
        foreach ($_SESSION['products'] as $key => $product) {
            if ($pid === $product['product_id']) {
                unset($_SESSION['products'][$key]);
            }
        }
    }

But to make your work alot easier in the future you could also build your array like this:

$_SESSION['products'] = array(
    'product_id' => 'amount',
);

To add a product you would simply do:

$_SESSION['products'][$product_id] += $amount;

To count your products you could use:

count($_SESSION['products']);

Here is a simple example of what your functions could be like:

function addProduct($pid, $value = 1) {
    $_SESSION['products'][$pid] += $value;
}

function removeProduct($pid) {
    unset($_SESSION['products'][$pid]);
}

function countProducts() {
    return count($_SESSION['products']);
}

Good luck!

如何取消设置$ _SESSION数组中的项目

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