How to delete/unset a cookie on php?

Question

I want to unset/delete my existing cookie with this:

setcookie ("user", "", time()-1); 
unset($user);

But cookies can not be deleted or unset. So what is problem?

Answer 1

you can unset cookies this way only may -1 not work

try this

setcookie ("user", "", time() - 3600);

Answer 2

When deleting a cookie you should assure that the expiration date is in the past.

Delete example:

// set the expiration date to one hour ago
setcookie("user", "", time()-3600);

Answer 3

Nothing - that code looks fine to me.

Quoting the docs:

When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser.

setcookie ("TestCookie", "", time() - 3600);

You may like to specify a time that's more in the past to avoid problems with the computer's time that may be a bit off.

Additionally, in some cases it's useful to actually unset $_COOKIE['TestCookie'] as well.