<a href="<?php echo $row['url_img']; ?>" data-toggle="lightbox" data-title="<?php echo $row['title']; ?>"><img src="<?php echo $row['url_img']; ?>" class="img-thumbnail" style="max-width: 480px; margin-bottom: 20px; margin-left: 20px;"></a>

<script type="text/javascript">
    $(document).on('click', '[data-toggle="lightbox"]', function(event) {
            event.preventDefault();
            $(this).ekkoLightbox();
        });
</script>