Remove a cookie

Question

When I want to remove a Cookie I try

unset($_COOKIE[\'hello\']);

I see in my cookie browser from firefox that the cookie still exists. How

Answer 1

A clean way to delete a cookie is to clear both of $_COOKIE value and browser cookie file :

if (isset($_COOKIE['key'])) {
    unset($_COOKIE['key']);
    setcookie('key', '', time() - 3600, '/'); // empty value and old timestamp
}