I have a php application for which I have a page which creates
temporary junk and puts it into a persistent store (in this case a
postgres database, but that is beside the point.)
I have a Save button which puts the stuff I really want into the
persistent store and cleans up the temporary junk. I have a Cancel
button which only cleans up the temporary junk.
I would really like to have the cleanup code run anytime a user
leaves the page without hitting the Save button. Is there anyway to do
this? I.e. have php code called conditionally on exiting the page?
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