I have 2 codes for a “download images button”:

1. to create the zip files:

function create_product_images_zip($product_id) {
    // Load the WordPress Filesystem API
    if ( ! defined('ABSPATH') ) {
        exit; // Exit if accessed directly
    }

    require_once ABSPATH . 'wp-admin/includes/file.php';
    WP_Filesystem();

    global $product;
    $product = wc_get_product($product_id);

    if (!$product) {
        return;
    }

    // Get the product images
    $featured_image_id = $product->get_image_id();
    $gallery_image_ids = $product->get_gallery_image_ids();

    // Get the upload directory
    $upload_dir = wp_upload_dir();
    $zip_file = $upload_dir['basedir'] . '/product-images-' . $product_id . '.zip';

    // Initialize the ZIP archive
    $zip = new ZipArchive();
    if ($zip->open($zip_file, ZipArchive::CREATE | ZipArchive::OVERWRITE) !== true) {
        return;
    }

    // Add the featured image to the ZIP
    if ($featured_image_id) {
        $featured_image_url = wp_get_attachment_url($featured_image_id);
        $featured_image_path = get_attached_file($featured_image_id);
        $zip->addFile($featured_image_path, basename($featured_image_path));
    }

    // Add the gallery images to the ZIP
    if (!empty($gallery_image_ids)) {
        foreach ($gallery_image_ids as $gallery_image_id) {
            $gallery_image_url = wp_get_attachment_url($gallery_image_id);
            $gallery_image_path = get_attached_file($gallery_image_id);
            $zip->addFile($gallery_image_path, basename($gallery_image_path));
        }
    }

    // Close the ZIP archive
    $zip->close();

    return $upload_dir['baseurl'] . '/product-images-' . $product_id . '.zip';
}

And 2) to create the download button:

add_action('woocommerce_single_product_summary', 'add_download_all_images_button', 25);

function add_download_all_images_button() {
    global $product;

    if ($product) {
        $product_id = $product->get_id();
        $zip_url = create_product_images_zip($product_id);

        if ($zip_url) {
            echo '<a href="' . esc_url($zip_url) . '" class="custom-download-button" download>Download All Images</a>';
        }
    }
}

This button is linked to the product description on WooCommerce. I want to linked it with the image gallery, so it appear under the photos. i tried this for the zip file part:

function create_product_images_zip($product_id) {
    // Create a new ZIP file
    $zip = new ZipArchive();
    $upload_dir = wp_upload_dir();
    $zip_file = tempnam($upload_dir['path'], 'product_images_') . '.zip';

    if ($zip->open($zip_file, ZipArchive::CREATE) !== TRUE) {
        return false;
    }

    // Get all the product images (including gallery images)
    $attachment_ids = array();
    $attachment_ids[] = get_post_thumbnail_id($product_id); // Featured image
    $attachment_ids = array_merge($attachment_ids, $product->get_gallery_image_ids()); // Gallery images

    // Add each image to the ZIP file
    foreach ($attachment_ids as $attachment_id) {
        $image_url = wp_get_attachment_url($attachment_id);
        $image_path = get_attached_file($attachment_id);

        if (file_exists($image_path)) {
            $zip->addFile($image_path, basename($image_path));
        }
    }

    // Close the ZIP file
    $zip->close();

    // Return the URL to the ZIP file
    $zip_url = $upload_dir['url'] . '/' . basename($zip_file);
    return $zip_url;
}

And this for the download button:

add_action('woocommerce_product_thumbnails', 'add_download_all_images_button', 20);

function add_download_all_images_button() {
    global $product;

    if ($product) {
        $product_id = $product->get_id();
        $zip_url = create_product_images_zip($product_id);

        if ($zip_url) {
            echo '<a href="' . esc_url($zip_url) . '" class="custom-download-button" download>Download All Images</a>';
        }
    }
}

And it is breaking the website. Where are the errors?

I tried to change the code as previously explained, but it breaks the product page completely.