How can I destroy cookies

Goodday Everybody, I set cookie by using the codes below

<?php
$cookie_expire = time()+3600;
$cookie_name = "users";
$cookie_value = "$_POST[f_name] $_POST[s_name]";
$ret = setcookie('users', $cookie_value, $cookie_expire, "/");if (!
$ret)
{
echo "Unable ot set cookie";

}

?>

and the cookie was actually set and are working as espected but I am
trying to destroy the cookie using the codes below.

<?php
setcookie('users', 'NULL', mktime()-10000, '/');
?>

but it is not destroying the cookies. Please I need your help
because
I am using the cookies for users authentation.

I am using the cookie to check if users logged in properly.

Thanks

Damelinks

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