How to delete all cookies in PHP?

Question

setcookie('id', null, 1, "/", ".domain.name");

The above will only delete a specific cookie,but how to delete them all?

And if I've set cookie[person][name], cookie[person][id], cookie[person][age],how to unset cookie[person]?

It's actually 2 questions.

Answer 1

This should do the trick:

foreach ($_COOKIES as $c_id => $c_value)
{
    setcookie($c_id, NULL, 1, "/", ".domain.name");
}

Answer 2

Man, isn't it easier to just wipe out all cookies like this:

$_COOKIE=array();