How to Expire Cookies?

Question

Eae you guys, It is as follows I have created a login system that uses cookie to remember the password of the user until then everything well works normal, the problem is time to inspire these cookies, on my site’s dashboard has a quit button which is nothing more than a small form that when clicked sends via post a request to the same page of which has a condition saying if the post method comes out then expire the user cookie and password, that this the problem the cookies do not expire in no way I have tried all possible methods I found on the internet as these.

setcookie("usuario"," ",time()-10);
setcookie("usuario","",time()-10);
setcookie("usuario",NULL);
setcookie("usuario");

None of these methods worked anyone would know if you need anything else ?

Answer 1

I think this will solve the problem:

if (isset($_COOKIE['usuario'])) {
    unset($_COOKIE['usuario']);
    setcookie('usuario', null, -1, '/');
    return true;
} else {
    return false;
}