I'm making a theme for a client in WordPress and he wants each gallery to have a grouped lightbox, so there's a lightbox for each gallery. I found out you can make it add an attribute to the gallery automatically, so what I want is an attribute called
'class' that has a number that adds by 1 for each gallery created. How would I do that?
I see that I was not being specific enough so here's some more information: I want a
'class=""' attribute added automatically to the shortcode when the post gets created. Inside that class attribute I want it to have a number that goes up by 1 for each post containing a gallery. So the shortcode would end up like this:
[gallery class="1" ...] and the next
[gallery class="2" ...] and so on...