Now, per page is not that interesting (I think at.
ONCE takes one parameter, which can be either :page or :publish. Now, per page is not that interesting (I think at least, I haven’t really found any use for that,) but per publish is great.. What it means is that whatever you paste within ONCE will be evaluated only once per page or per publish.
Original text search at: ystoreblog.com/blog/2007/10/