woocommerce-display-product-discount-order-summary-checkout-cart
/**
* @snippet WooCommerce: Display Product Discount in Order Summary @ Checkout, Cart
* @author Sandesh Jangam
* @donate $7 https://www.paypal.me/SandeshJangam/7
*/
add_filter( 'woocommerce_cart_item_subtotal', 'ts_show_product_discount_order_summary', 10, 3 );
function ts_show_product_discount_order_summary( $total, $cart_item, $cart_item_key ) {
//Get product object
$_product = $cart_item['data'];
//Check if sale price is not empty
if( '' !== $_product->get_sale_price() ) {
//Get regular price of all quantities
$regular_price = $_product->get_regular_price() * $cart_item['quantity'];
//Prepend the crossed out regular price to actual price
$total = '<span style="text-decoration: line-through; opacity: 0.5; padding-right: 5px;">' . wc_price( $regular_price ) . '</span>' . $total;
}
// Return the html
return $total;
}