Well, the only good ways to encode a string, is first to put it in an array. Then you can serialise() it and then write it into the cookie, which can be decoded with unserialise(). If you prefer NOT to use an array but a string, you should first urlencode() it and then base64_encode(). Both can decoded again with their opposite functions called urldecode() and base64_decode().

I hope this helps you out.

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