CSRF regenerate with AJAX

That looks, and sounds like it's ok...

My only additional observaton is that if all the submissions are done using ajax (which may be the case, seeing: $(form).serializeArray() in your code), then sticking copies of the same token in every form is wasteful in terms of processing time and effort - having the token as an ajax global, or if you really want it stuck into the DOM, having a single copy of it inserted (somewhere close to the top of the document) that is then extracted (and appended to the next post) by the ajax submission call would seem more efficient.

Naaah, it seems brutal, but its not wasteful with processing time - Javascript is client-side!  I think it can work with a hundred little forms no problem - but I never design sites with too many forms - this is for administration panel, editing and deleting photos. I tried to make it as plug-and-play as possible so I may use it in various sections of the admin panel.

You can see things I made with codeigniter here: itart.pro its not overly impressive as I have very little time to learn.