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

Answer 1

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);