訂單 新增顯示購買商品總數量

//訂單 新增顯示購買商品總數量
function get_total_number_of_items_in_order( $order_id ) {
    $order = wc_get_order( $order_id );
    $total_quantity = 0;
    foreach ( $order->get_items() as $item_id => $item ) {
       $quantity = $item->get_quantity();
       $total_quantity += $quantity;
    }
    return $total_quantity;
}

function display_total_quantity_in_order_details( $order_id ) {
    $total_quantity = get_total_number_of_items_in_order( $order_id );
    ?>

            <tr>
                <td class="label"><?php esc_html_e( '商品數量:', 'woocommerce' ); ?></td>
                <td width="1%"></td>
                <td class="total">
                    <?php echo $total_quantity; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
                </td>
            </tr>

    <?php
}

add_action( 'woocommerce_admin_order_totals_after_discount', 'display_total_quantity_in_order_details', 10 );