ng gallery custom loop to acess gallery

ng-gallery-custom.php

<?php
            $code = get_field('ng_gallery_code');
            if ($code):
                ?>
                <?php
                global $nggdb;
                $gallery = $nggdb->get_gallery($code, 'sortorder', 'ASC', true, 0, 0);
                if ($gallery):
                    ?>
                    <div class="trip-gallery">
                        <?php
                        foreach ($gallery as $image) {
                            /*echo $image->description;*/
                            ?>
                            <a class="fancybox-thumbs" data-fancybox-group="thumb"
                               href="<?php echo $image->imageURL; ?>"><img src="<?php echo $image->imageURL; ?>"
                                                                           alt="<?php echo $image->alttext; ?>"/></a>
                        <?php } ?>

                    </div>
                    <?php
                endif;
            endif; ?>