Deleting Cookies in PHP

PHP does not have a built-in mechanism for deleting cookies. Therefore, cookies are deleted using a clever method - by setting the cookie's 'death' time to the current moment:

php<?php
  setcookie('test', '', time());
?>

Deleting a cookie will lead to a change in $_COOKIE only after the page is reloaded:

php<?php
  setcookie('test', '', time());
  var_dump($_COOKIE['test']); // will output the cookie value the first time
?>