php wordpress woocommerce hook-woocommerce coupon

Split discount (coupon) row into multiple deducted cost rows in WooCommerce order totals table

If there are 2 discount coupons used, it shows the sum of 2 coupons in the Woocommerce order totals table, while I want to show the deducted cost of each coupon separately.

For example, 2 coupons are inserted, currently it shows:

coupon : $100

I want to change this to:

coupon1(coupon code) : $50
coupon2(coupon code) : $50

Path from the WooCommerce template file: order-details.php

foreach ( $order->get_order_item_totals() as $key => $total ) {
    ?>
        <tr>
            <th scope="row"><?php echo esc_html( $total['label'] ); ?></th>
            <td><?php echo ( 'payment_method' === $key ) ? esc_html( $total['value'] ) : wp_kses_post( $total['value'] ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?></td>
        </tr>
        <?php
}

Any advice on how to change this?

Solution

It is not necessary to add HTML table tags via the woocommerce_get_order_item_totals hook, since it concerns table rows.

Next answer removes the default discount row and splits it over several rows with the desired details.

Functions used in this answer:

WC_Abstract_Order::get_coupon_codes()
get_discount()
get_code()

So you get:

function filter_woocommerce_get_order_item_totals( $total_rows, $order, $tax_display ) {
    // Exit if there is no coupons applied
    if ( sizeof ( $order->get_coupon_codes() ) == 0 ) return $total_rows;
    
    // Initializing
    $new_rows = [];
    
    // Loop through order total lines
    foreach ( $total_rows as $total_key => $total_row ) {
        // Store current rows, except discount
        if ( $total_key != 'discount' ) {
            // Store
            $new_rows[$total_key] = $total_row;
        } else {            
            // For each coupon
            foreach ( $order->get_items('coupon') as $coupon ) {
                // New rows
                $new_rows[$coupon->get_code()] = array(
                    'label' => __( 'Coupon: ', 'woocommerce' ) . $coupon->get_code(),
                    'value' => wc_price( $coupon->get_discount() ),
                );
            }   
        }
    }

    // Overwrite
    $total_rows = $new_rows;

    return $total_rows;
}
add_filter( 'woocommerce_get_order_item_totals', 'filter_woocommerce_get_order_item_totals', 10, 3 );

Result: