updating product subtotal in cart contents - woocommerce

Question

I've trying to write my campaign plugin.
Here is the problem,
I want to update, line_subtotal and line_total in a product in $cart_items.
1- woocommerce_cart_product_subtotal is not really working.
2- I tried to redefine array's element by cart_item_key
foreach($cartItems as $hash => $perProduct)
{
if($perProduct['product_id'] = $lastItemsProductId)
{
if($lastItemsQuantity > 1)
{
$lineSubtotal = data_get($lastItemInCart, 'line_subtotal');
$lineTotal = data_get($lastItemInCart, 'line_total');
$newQuantity = $lastItemsQuantity-1;
$lastItemInCart['line_subtotal'] = $newQuantity * $lastItemsPrice;
$lastItemInCart['line_total'] = $newQuantity * $lastItemsPrice;
$cartItems[$lastItemsKey] = $lastItemInCart;
WC()->cart->calculate_totals();
} else {
}
}
}
Also this function runs, in woocommerce_before_calculate_totals action.
When i try it, with woocommerce_get_cart_contents filter, my cart empty itself .
3- The scenario :
When i add A product, (if is selected by system) and if quantity is more than 2, i want to make discount about this product.
Any helps ? Thanks.
Here is the answer
/**
* Add filter for order list
*
* #param [int] $product_subtotal
* #param [object] $product
* #param [int] $quantity
* #param [array] $cart
* #return void
*/
public function filterWoocommerceCartProductSubtotal($product_subtotal, $product, $quantity, $cart) : string
{
$appliedCoupons = $cart ? $cart->get_applied_coupons() : null;
$cartCount = $cart ? count($cart->get_cart()) : 0;
$cartItems = $cart->get_cart();
$lastItemInCart = last($cartItems);
$lastItemsProductId = data_get($lastItemInCart, 'product_id', data_get($lastItemInCart, 'product_id'));
$lastItemsPrice = $lastItemInCart['data']->get_regular_price();
$lastItemsQuantity = data_get($lastItemInCart, 'quantity');
$lastItemsKey = data_get($lastItemInCart, 'key');
if( in_array('3al2ode', $appliedCoupons)){
if($lastItemsQuantity > 1) {
if(#data_get($product,'id') == $lastItemsProductId)
{
$newSubTotal = 0;
$price = $product->get_price();
$newQuantity = $lastItemsQuantity-1;
$quantity = $newQuantity;
$newSubTotal += $price * $quantity;
return $newSubTotal ? wc_price($newSubTotal) : $product_subtotal;
}
}
}
return $product_subtotal;
}
The right, filter should be like;
add_filter( 'woocommerce_cart_product_subtotal', [$this,'filterWoocommerceCartProductSubtotal'], 10, 4);

Answer 1

As per your current scenario - When I add A product, (it is selected by the system) and if the quantity is more than 2, I want to make a discount on this product.
You should try this-
add_action( 'woocommerce_cart_calculate_fees','woocommerce_add_discount',10, 1 );
function woocommerce_add_discount() {
global $woocommerce;
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
$cart_qty = count($woocommerce->cart->get_cart());
if($cart_qty > 2)
{
$percentage = 0.5;
$cart_subtotal = $woocommerce->cart->get_subtotal() ?: 0;
//$cart_total = $woocommerce->cart->cart_contents_total;
//$shipping_total = $woocommerce->cart->get_shipping_total() ?: 0;
//$tax_total = $woocommerce->cart->get_taxes_total() ?: 0;
//$grand_total = $cart_total + $shipping_total + $tax_total;
// Calculate the amount to reduce
$discount = $cart_subtotal * $percentage;
$woocommerce->cart->add_fee( 'Discount 50%', -$discount, true, '' );
}
}
You can update/modify condition accordingly.

Answer 2

/**
* Add filter for order list
*
* #param [int] $product_subtotal
* #param [object] $product
* #param [int] $quantity
* #param [array] $cart
* #return void
*/
public function filterWoocommerceCartProductSubtotal($product_subtotal, $product, $quantity, $cart) : string
{
$appliedCoupons = $cart ? $cart->get_applied_coupons() : null;
$cartCount = $cart ? count($cart->get_cart()) : 0;
$cartItems = $cart->get_cart();
$lastItemInCart = last($cartItems);
$lastItemsProductId = data_get($lastItemInCart, 'product_id', data_get($lastItemInCart, 'product_id'));
$lastItemsPrice = $lastItemInCart['data']->get_regular_price();
$lastItemsQuantity = data_get($lastItemInCart, 'quantity');
$lastItemsKey = data_get($lastItemInCart, 'key');
if( in_array('3al2ode', $appliedCoupons)){
if($lastItemsQuantity > 1) {
if(#data_get($product,'id') == $lastItemsProductId)
{
$newSubTotal = 0;
$price = $product->get_price();
$newQuantity = $lastItemsQuantity-1;
$quantity = $newQuantity;
$newSubTotal += $price * $quantity;
return $newSubTotal ? wc_price($newSubTotal) : $product_subtotal;
}
}
}
return $product_subtotal;
}
The right, filter should be like;
add_filter( 'woocommerce_cart_product_subtotal', [$this,'filterWoocommerceCartProductSubtotal'], 10, 4);