WooCommerce: Order as CSV and attach to emails

snipped.php

<?php

add_filter('woocommerce_email_attachments', function ($attachments, $emailId, $order) {
    /* @var WC_Order $order */
    $attachTo = [
        'new_order',
        'customer_on_hold_order',
        'customer_processing_order',
        'customer_completed_order',
        'customer_refunded_order',
        'customer_partially_refunded_order',
        'cancelled_order',
        //'failed_order',
        //'customer_reset_password',
        //'customer_invoice',
        //'customer_new_account',
        //'customer_note',
    ];

    if (in_array($emailId, $attachTo)) {
        //$data = $order->get_data();
        $items = $order->get_items();

        /**
         * The CSV heading
         */
        $list[] = [
            'Material',
            'x',
            'y',
            'z',
            'Menge',
            'Preis',
        ];

        foreach ($items as $item) {
            /*
             * Product Price: 35
             * Quantity: 2
             *
             * $order->get_item_total($item)    35
             * $order->get_item_subtotal($item) 35.00
             * $order->get_line_total($item)    70
             * $order->get_line_subtotal($item) 70
             * */

            /* @var WC_Order_Item $item */
            $list[] = [
                $item->get_name(),
                $item->get_meta('x'),
                $item->get_meta('y'),
                $item->get_meta('z'),
                $item->get_quantity(),
                $order->get_item_subtotal($item, true),
            ];
        }

        $dir = __DIR__.'/data';
        if (!is_dir($dir)) {
            wp_mkdir_p($dir);
        }
        $htaccessFile = $dir.'/.htaccess';
        if (!file_exists($htaccessFile)) {
            file_put_contents($htaccessFile, "Order deny,allow\nDeny from all");
        }

        $fileName = $dir.'/'.$order->get_id().'.csv';
        $file = fopen($fileName,'w');

        foreach ($list as $line) {
            fputcsv($file, $line, ';');
        }

        fclose($file);

        $attachments[] = $fileName;
    }

    return $attachments;
}, 10, 3);