Display Custom Total Saving in generated invoice in WooCommerce 3

In WooCommerce I am using WooCommerce Print Invoices & Packing lists plugin…

How can I display the total savings of any order in the invoices generated by this plugin ?

1 year ago I have been using this code based on [this answer] and that was working before I updated WooCommerce :

<?php 

    $discount_total = 0;
    $_order = wc_get_order( $order_id );
    foreach ($_order->get_items() as $order_item) {
        if ($order_item['variation_id'] > 0) {
            $line_item = wc_get_product( $order_item['variation_id'] );
        } else {
            $line_item = wc_get_product( $order_item['product_id'] );
        }
        $sale_price = $line_item->sale_price;
        $regular_price = $line_item->regular_price;

        if ( !empty($sale_price) ) {
            $discount = ($regular_price - $sale_price) * $order_item['item_meta']['_qty'][0];
            $discount_total += $discount;
        }
    }
    $discount_saving = round ( $discount_total + $_order->get_total_discount() );
    if ( $discount_total > 0 ) {

    <tr>
        <td class="order_saving" colspan="5"><strong><?php _e( 'Total Savings:  ', 'woocommerce' ); ?></strong></td>
        <td class="value" colspan="2" ><span class="woocommerce-Price-saving saving"><?php echo $discount_saving ; ?></span></td>
    </tr>
<?php } ?>

JavaScript
​x
 
<?php ​    $discount_total = 0;    $_order = wc_get_order( $order_id );    foreach ($_order->get_items() as $order_item) {        if ($order_item['variation_id'] > 0) {            $line_item = wc_get_product( $order_item['variation_id'] );        } else {            $line_item = wc_get_product( $order_item['product_id'] );        }        $sale_price = $line_item->sale_price;        $regular_price = $line_item->regular_price;​        if ( !empty($sale_price) ) {            $discount = ($regular_price - $sale_price) * $order_item['item_meta']['_qty'][0];            $discount_total += $discount;        }    }    $discount_saving = round ( $discount_total + $_order->get_total_discount() );    if ( $discount_total > 0 ) {​    <tr>        <td class="order_saving" colspan="5"><strong><?php _e( 'Total Savings:  ', 'woocommerce' ); ?></strong></td>        <td class="value" colspan="2" ><span class="woocommerce-Price-saving saving"><?php echo $discount_saving ; ?></span></td>    </tr><?php } ?>​

So now it doesn’t works anymore. I have tried to make changes without success.

So what is the right solution?

Answer

Here is the updated code that will work for WooCommerce version 3+:

<?php 
///////////// HERE BEGINS CUSTOMIZATION /////////////

$discount_total = 0;
$_order = wc_get_order( $order_id );
foreach ($_order->get_items() as $line_item) {
    // The WC_product object
    $_product = $line_item->get_product(); 

    // The product prices
    $sale_price = $_product->get_sale_price();
    $regular_price = $_product->get_regular_price();

    if ( !empty($sale_price) ) {
        $discount = ($regular_price - $sale_price) * $line_item->get_quantity();
        $discount_total += $discount;
    }
}

$discount_saving = round ( $discount_total + $_order->get_total_discount() );

if ( $discount_total > 0 ) {
    ?>

    <tr>
    <td class="order_saving" colspan="5"><strong><?php _e( 'Total Savings: ', 'woocommerce' ); ?></strong></td>
    <td class="value" colspan="2" ><span class="woocommerce-Price-saving saving"><?php echo $discount_saving ; ?></span></td>
    </tr>

    <?php
}
///////////// END OF CUSTOMIZATION ///////////// 
?>

JavaScript
 
<?php ///////////// HERE BEGINS CUSTOMIZATION /////////////​$discount_total = 0;$_order = wc_get_order( $order_id );foreach ($_order->get_items() as $line_item) {    // The WC_product object    $_product = $line_item->get_product(); ​    // The product prices    $sale_price = $_product->get_sale_price();    $regular_price = $_product->get_regular_price();​    if ( !empty($sale_price) ) {        $discount = ($regular_price - $sale_price) * $line_item->get_quantity();        $discount_total += $discount;    }}​$discount_saving = round ( $discount_total + $_order->get_total_discount() );​if ( $discount_total > 0 ) {    ?>​    <tr>    <td class="order_saving" colspan="5"><strong><?php _e( 'Total Savings: ', 'woocommerce' ); ?></strong></td>    <td class="value" colspan="2" ><span class="woocommerce-Price-saving saving"><?php echo $discount_saving ; ?></span></td>    </tr>​    <?php}///////////// END OF CUSTOMIZATION ///////////// ?>​

This should works for you now

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Answer