我正在用PHP编写一个自定义购物车，我将产品信息添加到购物车会话中，如下所示：
$product_array=array($title,$price,$qty);
if(!isset($_SESSION['cart']))
$_SESSION['cart']=array();
if(!in_array($product_array,$_SESSION['cart']))
$_SESSION['cart'][]=$product_array;
else
{
// update price and quantity here
}
我的挑战是：如果产品已经存在于$\u SESSION['cart]数组中，我想更新产品的价格和数量（$qty），而不是添加它。像这样的
price = price + $price,
qty = qty + $qty
此示例与您的示例类似。您可以在else条件下从foreach循环添加代码。我正在考虑product_id而不是$title变量。
$_SESSION['cart'][] = [ 'product_id'=> 12, 'price' => 100 , 'quantity' => 2 ];
$_SESSION['cart'][] = [ 'product_id'=> 11, 'price' => 200, 'quantity' => 3 ];
$product_array = ['product_id' => 11, 'price'=> 200, 'quantity' => 4 ];
foreach( $_SESSION['cart'] as $key => $value ) {
if( $value['product_id'] == $product_array['product_id']) {
$_SESSION['cart'][$key]['quantity'] = $value['quantity'] + $product_array['quantity'];
$_SESSION['cart'][$key]['price'] = $value['price'] + $product_array['price'];
}
}
print_r($_SESSION);
更新产品前的输出：
Array
(
[cart] => Array
(
[0] => Array
(
[product_id] => 12
[price] => 100
[quantity] => 2
)
[1] => Array
(
[product_id] => 11
[price] => 200
[quantity] => 3
)
)
)
在会话中添加新产品后的输出。
Array
(
[cart] => Array
(
[0] => Array
(
[product_id] => 12
[price] => 100
[quantity] => 2
)
[1] => Array
(
[product_id] => 11
[price] => 400
[quantity] => 7
)
)
)
