Generare la lista dei clienti in WooCommerce

<?php
$_customer_orders = '';
$_customer_orders_products = '';

$query = new WC_Order_Query( array(
    'limit' => -1,
    'orderby' => 'date',
    'order' => 'DESC',
    'return' => 'ids',
     'date_query' => array(
        array(
        )
    )
) );

$orders = $query->get_orders();

foreach ($orders as $order_id){

$_wc_get_order = wc_get_order($order_id);
$order_obj = new WC_Order( $order_id );
$email = $order_obj->billing_email;
$user_id = get_post_meta($order_id, '_customer_user', true);

if($email !== ''){
    $_date_formatted = $order_obj->get_date_created();
    $_customer_orders .= $order_id.','. $order_obj->get_billing_first_name().','.$email.PHP_EOL;

    //# products
    $_order_obj = wc_get_order($order_id);
    $_items = $_order_obj->get_items();
    foreach ( $_items as $item ) {
        $product_name = $item->get_name();
        $product_id = $item->get_product_id();

        $product_variation_id = $item->get_variation_id();
        if ( !empty($product_variation_id) ) {
            $variation = wc_get_product($product_variation_id);
            $variation_get_title = $variation->get_title();
        }else{
            $variation_get_title = '';
        }
        $_customer_orders_products .= $order_id.','. $order_obj->get_billing_first_name().','.$email.','.$product_id.','.$product_name.' '.$variation_get_title.PHP_EOL;

    }
    
}

}