Updating Values in A Multidimensional Cart Array

I am writing a custom shopping cart in PHP, I add product info to the cart session like this:

$product_array=array($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
}


My challenge: I want to update the price and quantity($qty) of the product if it already exists in
$_SESSION['cart'] array rather than adding it. Something like this

price = price + $price,
qty = qty + $qty


1 Answer
1

This example is similar to your example. you can add code from foreach loop in else condition. I am considering product_id instead of $title variable.

$_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);


Output before updating product :

Array
(
[cart] => Array
(
[0] => Array
(
[product_id] => 12
[price] => 100
[quantity] => 2
)
[1] => Array
(
[product_id] => 11
[price] => 200
[quantity] => 3
)
)
)


Output after adding new product in session.

Array
(
[cart] => Array
(
[0] => Array
(
[product_id] => 12
[price] => 100
[quantity] => 2
)
[1] => Array
(
[product_id] => 11
[price] => 400
[quantity] => 7
)
)
)


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