Add incremental number before item name on WooCommerce order emails

Question

I have a WooCommerce store and everything is working well. But I would like to add a number in front of every item name when an order is placed so I can put numbers on the box so the customer knows which box contains what product.

(I only have 1 product but the custommer can customize that product with a lot of product options)

Example: in the order email, the product name stays the same but an incremental number is placed in front of the name.

1. product
2. product
3. product

I use this code to edit the product name:

add_filter( 'woocommerce_order_item_name', 'change_orders_items_names', 10, 1 );

function change_orders_items_names( $item_name ) {
    $item_name = 'mydesiredproductname';
    return $item_name;
}

---

But I do not know how to add an incremental number to the product name.

Is there anyone who knows how to do this? Or can point me in the right direction?

Answer 1

The woocommerce_order_item_name filter hook is called multiple times, therefore it is difficult to add a number in the function itself.

Via woocommerce_checkout_create_order we first add the number as meta_data for each $item. Afterwards via get_meta, we add the number in front of the product name.

So you get:

function action_woocommerce_checkout_create_order( $order, $data ) {    
    // Start number
    $number = 1;
    
    // Loop through order items
    foreach ( $order->get_items() as $item_key => $item ) {
        // Update meta data for each item
        $item->update_meta_data( '_product_number', $number );
    
        // Number +1
        $number = $number + 1;
    }
}
add_action( 'woocommerce_checkout_create_order', 'action_woocommerce_checkout_create_order', 10, 2 );

function filter_woocommerce_order_item_name( $item_name, $item ) {  
    // Get meta
    $product_number = $item->get_meta( '_product_number' );
    
    // NOT empty
    if ( ! empty ( $product_number ) ) {
        $item_name = $product_number . '. ' . $item_name; 
    }

    return $item_name;
}
add_filter( 'woocommerce_order_item_name', 'filter_woocommerce_order_item_name', 10, 2 );

---

Note: add is_wc_endpoint_url, to apply it only for email notifications.

function filter_woocommerce_order_item_name( $item_name, $item ) {
    // Only for email notifications
    if ( is_wc_endpoint_url() ) 
        return $item_name;

    // Get meta
    $product_number = $item->get_meta( '_product_number' );
    
    // NOT empty
    if ( ! empty ( $product_number ) ) {
        $item_name = $product_number . '. ' . $item_name; 
    }

    return $item_name;
}
add_filter( 'woocommerce_order_item_name', 'filter_woocommerce_order_item_name', 10, 2 );