How can I set a cookie and then redirect in PHP?

After doing a bit of processing, I want to set a cookie value to user input and then redirect them to a new page. However, the cookie is not getting set. If I comment out the redirect, then the cookie is set successfully. I assume this is a header issue of some sort. What is the best workaround for this situation?

if($form_submitted) {
    ...
    setcookie('type_id', $new_type_id, time() + 60*60*24*30);
    header("Location: $url");
    exit;
}

Note that setcookie returns true in either case and I get no errors/warnings/notices.

EDIT: I am using Unix/Apache/MySQL/PHP

From stackoverflow

• How are you testing if the cookie is set? Cookies are available on the next page after they are set.

  Common Pitfalls:

  Cookies will not become visible until the next loading of a page that the cookie should be visible for. To test if a cookie was successfully set, check for the cookie on a next loading page before the cookie expires. Expire time is set via the expire parameter. A nice way to debug the existence of cookies is by simply calling print_r($_COOKIE);.

  Wickethewok : I was checking whether the cookie was set through a browser plugin. Even if I then navigate to another page and check my cookies, it is not set.

• I'm assuming you are running IIS? There is a know bug with IIS versions less than 7 when attempting to both set a cookie and a location header in the same request.

  http://support.microsoft.com/kb/q176113/

• If you have human urls (like www.domain.com/path1/path2/), then you must set cookie path to / to work for all paths, not just current one.

  if($form_submitted) {
      ...
      setcookie('type_id', $new_type_id, time() + 60*60*24*30, '/');
      header("Location: $url");
      exit;
  }
  

  From PHP manual:

  The path on the server in which the cookie will be available on. If set to '/', the cookie will be available within the entire domain . If set to '/foo/', the cookie will only be available within the /foo/ directory and all sub-directories such as /foo/bar/ of domain . The default value is the current directory that the cookie is being set in.