Sku in pdf

I’ve added and it works!

foreach ( $order_items as $item_id => $order_item ) {
$product_id = $order_item[‘product_id’];
$product = wc_get_product( $product_id );
$sku = $product->get_sku();
$html .= ” . $order_item->get_name() . ” . $product->get_sku() . ” . number_format( $order_item->get_quantity(), 2, ‘.’, ” ) . ” . $currency . ‘ ‘ . number_format( $order_item->get_total(), 2, ‘.’, ” ) . ”;
}