"If you wish to assign multiple values to a single cookie, just add  to
the cookie name. "
So if you wanted to set one cookie to hold all of your items, you should be
able to setcookie("items", item1), setcookie("items", item2), etc up to
itemN. Then you can access the items as an array in a PHP script. I'm pretty
sure that handling your list of items in this manner would allow you to
store a large number of items in the same cookie without setting additional
cookies and running into the upper limit of 20.
IIRC there is a browser-set limit to the size of a given cookie, around 4k. That's pretty big, but there is a limit and it may vary by browser, so it's to your advantage to keep it short.
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