Add latest WooCommerce order product name as Mailchimp tag

functions.php

/**
 * Add customer's last order product name as Mailchimp member tag on sync
 */
function product_mailchimp_tag($tags, $email)
{
  $new_tags = [];
  $query = new WC_Order_Query();
  $query->set('customer', $email);
  $customer_orders = $query->get_orders();

  if ($customer_orders) {
    $last_order = $customer_orders[0];
    $products = $last_order->get_items();

    foreach ($products as $product) {
      $product_name_tag = [
        'name' => 'Current ' . $product->get_name(),
        'status' => 'active',
      ];
      array_push($new_tags, $product_name_tag);
    }
  }

  return array_merge($tags, $new_tags);
}

add_filter('mailchimp_user_tags', 'product_mailchimp_tag', 10, 2);

In your opinion, for add a certain attribute value, is correct this code?

function product_mailchimp_tag($tags, $email)
{
  $new_tags = [];
  $query = new WC_Order_Query();
  $query->set('customer', $email);
  $customer_orders = $query->get_orders();

  if ($customer_orders) {
    $last_order = $customer_orders[0];
    $products = $last_order->get_items();    

    foreach ($products as $product) {
        // Get the product attribute first value(s)
        $size = $product->get_attribute('pa_formato');
      $product_tags = [
        'name' => strpos($size),
        'status' => 'active'
      ];
      array_push($new_tags, $product_tags);
    }
  }

  return array_merge($tags, $new_tags);
}
add_filter('mailchimp_user_tags', 'product_mailchimp_tag', 10, 2);`

Looks legit to me. Needs testing!

This is exactly what I'm looking for. I added this code to my child theme's functions.php But it's not working. Any idea if this code still works with current versions of WooCommerce and MailChimp?