Wątki do których odpowiedź jest jak byk w manualu proszę umieszczać na Przedszkolu.
.
When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser. Examples follow how to delete cookies sent in previous example:
Przykład 1469. setcookie() delete example
<?php
// set the expiration date to one hour ago
setcookie ("TestCookie", "", time() - 3600, "/~rasmus/", ".example.com", 1
); ?>