Simply change the expires argument to a date in the past: "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;" To guarantee that you delete the correct cookie, you need define the cookie path.
The cookie attribute of the Document object in JavaScript can be used to manipulate cookies. The cookies that apply to the current web page can be read, created, modified, and deleted using JavaScript.
Cookie deletion: To delete a cookie, PHP does not have a specific function. All we have to do now is use the setcookie() function to update the cookie's expire-time value to a previous time. Deducting a few seconds from the current time is an easy approach to do this.
To erase a cookie, set the "expires" date to a date in the past. Your issue is most likely due to the date format not being standard.
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