WooCommerce从购物车获得小计值

Question

I use the module for calculating delivery by local carrier, but the module don't calculate shipping costs to the total.
In the wp-content/plugins/woocommerce/templates/order/order-details.php I added the following code to take the amount of shipping and subtotal:

     <?php $a = array(
         get_post_meta($order_id, 'Order_subtotal', true),
         get_post_meta($order_id, 'Econt_Customer_Shipping_Cost', true));
     ?>
     <tr class="total-cost">
         <th><?php _e( 'Total:', 'woocommerce'); ?></th>
         <td><?php echo array_sum($a); ?> <?php echo get_woocommerce_currency_symbol(); ?></td>
     </tr>

As a result, I get only the value of "Econt_Customer_Shipping_Cost", but not from "Order_subtotal" to get the total.

Please, can someone tell me what to use to get a working subtotal?

Answer 1

First 'Order_subtotal' does not exist in wp_postmeta table for 'shop_order' post-type.

Last very important thing: Don't overrinde templates directly in woocommerce plugin, to avoid loosing your changes when plugin is updated. You can better override this files by copying this 'templates' folder to your active child theme or theme and rename it woocommerce.
See this reference: Overriding WooCommerce Templates via a Theme…

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Changing your code (the answer)

As you have already at the beginning of this template $order = wc_get_order( $order_id );, you can use the class WC_Abstract_Order native functions get_subtotal( ) or get_total( ) directly from $order, without using get_post_meta() Wordpress function.

I have changed some things in your code:

<?php 
    $display_sum = $order->get_subtotal( ); // or $order->get_total( );
    $display_sum += get_post_meta( $order->id, 'Econt_Customer_Shipping_Cost', true );
    $display_sum .= ' '. get_woocommerce_currency_symbol( );
?>
<tr class="total-cost">
    <th><?php _e( "Total:", "woocommerce" ); ?></th>
    <td><?php echo $display_sum; ?></td>
</tr>

This should work as you want it, but this will not update the order total, it just display it.

References:

• Class - WC_Abstract_Order
• WooCommerce get order total