Add calculated saving total in Woocommerce order totals rows - php

Question

In Woocommerce, I am using the following code to calculate and display 'Total Saving' on the order in Cart and checkout pages:
function wc_discount_total_30() {
global $woocommerce;
$discount_total = 0;
foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values) {
$_product = $values['data'];
if ( $_product->is_on_sale() ) {
$regular_price = $_product->get_regular_price();
$sale_price = $_product->get_sale_price();
$discount = ($regular_price - $sale_price) * $values['quantity'];
$discount_total += $discount;
}
}
if ( $discount_total > 0 ) {
echo '<tr class="cart-discount">
<th>'. __( 'Saved', 'tsavedis' ) .'</th>
<td data-title=" '. __( 'Saved', 'tsavedis' ) .' ">'
. wc_price( $discount_total + $woocommerce->cart->discount_cart ) .'</td>
</tr>';
}
}
// Hook our values to the Basket and Checkout pages
add_action( 'woocommerce_cart_totals_after_order_total', 'wc_discount_total_30', 99);
add_action( 'woocommerce_review_order_after_order_total', 'wc_discount_total_30', 99);
I need to display this total saving in 'Order Edit' page at backend as a custom field.
How to do that ?

Answer 1

Here is the way to add the same thing to orders totals table:
// Display the chosen delivery information
add_filter( 'woocommerce_get_order_item_totals', 'add_saving_total_order_totals', 10, 3 );
function add_saving_total_order_totals( $total_rows, $order, $tax_display ) {;
$saving_total = 0;
// Loop through Order items
foreach($order->get_items() as $item ){
$product = $item->get_product();
if( $product->is_on_sale() ){
$regular_price = (float) $product->get_regular_price();
$active_price = (float) $product->get_price();
$saving_total += ($regular_price - $active_price) * $item->get_quantity();
}
}
if( $saving_total > 0 ) {
$discount_total = $order->get_discount_total();
$label = __( 'Saved', 'tsavedis' );
$value = wc_price( $saving_total + $discount_total );
$total_rows['saving'] = array( 'label' => $label,'value' => $value );
}
return $total_rows;
}
Code goes in function.php file of your active child theme (or active theme). tested and works.