Showing image

Hello,

I have a gallery that The plugin does not automatically add lightbox to.
The code I have is this:

<a rel="lightbox" href="<?php $image_id = get_post_thumbnail_id();
$image_url = wp_get_attachment_image_src($image_id,'large', true);
echo $image_url[0];  ?>"><?php echo $t->image->resizedImg( $item->img, 1140, 0 ); ?></a>

Bt this shows the post thumnail, while I want the lightbox to show the same image as the image that has the link.

Is this possible?

Greetings,

marcel

https://ww.wp.xz.cn/plugins/responsive-lightbox/