The documentation on cookies is quite explicit:

To retrieve a cookie, request it by name by calling cookie() method without the -value parameter.

I'm not sure where you have problems. Maybe you can show us the code and tell us where you get results that do not correspond to your expectations?

Again, what value do you get in $id and what value did you expect?

In reply to Re^3: cookie value by Corion
in thread cookie value by bigup401

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