You can delete all cookies that belong to your domain. See the answer to this here: https://stackoverflow.com/questions/2310558/how-to-delete-all-cookies-of-my-website-in-php .
You would have to build a form with a button to that (on submit) would call the function that deleted the cookies that belong to your domain. I don’t think you can delete cookies that don’t belong to your domain.
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