如果项目已经存在，则更新php会话数组中的产品数量

Question

I have implemented simple shopping cart using php.I can add product in cart and it adds to array.i Get my product id on url,when i click add to cart button based on thar url id i fetch product data from database and add to session array,but my problem is when i add same product i get new entry in session and the instead of updating quantity of that product. So what code i write to update the cart quantity if produt_id already there.?

This is print_r array value using $_SESSION['cart'] .

[cart] => Array
    (
        [0] => Array
            (
                [product-id] => 1
                [item] => mango
                [unitprice] => 20
                [quantity] => 1
            )
         [1] => Array
            (
                [product-id] =>2
                [item] => chickoo
                [unitprice] => 20
                [quantity] => 1
            )

    )

Answer 1

Sounds like you need to make sure the product_id isn't already in your session array. Try the following

$found = false;
foreach($_SESSION['cart'] as $product)
{
    if($_REQUEST['product_id'] == $product['product_id']) {
        $found = true;
        break;
    }
}

if($found)
{
    $_SESSION['cart'][$_REQUEST['product_id']]['quantity'] += 1;
} else {
    // go get new product and add to $_SESSION['cart']
}