The fact is that PHP is a Server-side script language which means that nothing is going to happen or execute without some Client-side intervention.

Unless you trigger the call yourself through GET or POST and such.

And in this case would JavaScript be great to handle that delayed saving.

Well you could use cronjobs to execute PHP on the server.

But that wouldent help the user.

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Of course the whole point of a doomsday machine, would have been lost if you keep it a secret.