Fix item_id notice

templates/emails/email-order-items.php

@@ -11,7 +11,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit; // Exit if accessed directly
 }
 
-foreach ( $items as $item ) :
+foreach ( $items as $item_id => $item ) :
 	$_product     = apply_filters( 'woocommerce_order_item_product', $order->get_product_from_item( $item ), $item );
 	$item_meta    = new WC_Order_Item_Meta( $item['item_meta'], $_product );
 	?>

templates/emails/plain/email-order-items.php

@@ -11,7 +11,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit; // Exit if accessed directly
 }
 
-foreach ( $items as $item ) :
+foreach ( $items as $item_id => $item ) :
 	$_product     = apply_filters( 'woocommerce_order_item_product', $order->get_product_from_item( $item ), $item );
 	$item_meta    = new WC_Order_Item_Meta( $item['item_meta'], $_product );
 
@@ -23,6 +23,9 @@ foreach ( $items as $item ) :
 		echo ' (#' . $_product->get_sku() . ')';
 	}
 
+	// allow other plugins to add additional product information here
+	do_action( 'woocommerce_order_item_meta_start', $item_id, $item, $order );
+
 	// Variation
 	echo $item_meta->meta ? "\n" . $item_meta->display( true, true ) : '';
 
@@ -50,6 +53,9 @@ foreach ( $items as $item ) :
 		}
 	}
 
+	// allow other plugins to add additional product information here
+	do_action( 'woocommerce_order_item_meta_end', $item_id, $item, $order );
+
 	// Note
 	if ( $show_purchase_note && $purchase_note = get_post_meta( $_product->id, '_purchase_note', true ) ) {
 		echo "\n" . $purchase_note;