Would this be an effective way to delete a cookie, then refresh the page so it displays the correct message? (displays logged in if cookie exists, not logged in if it doesn't)
PHP Code:
$is_set $HTTP_COOKIE_VARS['cookie_name'];

if(
$is_set != ""// $is_set has a value, so cookie exists/
{
    
setcookie("3dartisan_username"""time() - 100);
    
setcookie("3dartisan_password"""time() - 100);
    
header("Location: $PHP_SELF"); // refresh the page to display correct message