How can I do a custom form redirect on the user registration form?

Question

I added a custom submit function to the user registration form. I want to be able to redirect to the user profile edit. How can I get the uid of the record that is about to be created? global $user doesn't work:

function my_user_register_submit ($form, &$form_state) {
  global $user;
  $form_state['redirect'] = 'user/' . $user->uid . '/edit?registration=1&destination=blahblah'; 
}

Edit:

My use case is this: after registration I want to redirect the user to the "edit profile" page to complete the remaining profile fields. When they "skip" that or complete the form they go to their profile page. However, when a ?destination parameter is passed into the register form I want to carry that value to the "edit profile" page and then direct the user to that destination page when they are done.

Answer 1

Have a look at how login toboggan implements user_register_submit(): logintoboggan_user_register_submit(). It first save the $user in order to retrieve uid later.

function my_user_register_submit($form, &$form_state) {
  //Save $user
  $account = $form['#user'];
  $edit = array_intersect_key((array) $account, $form_state['values']);
  $account = user_save($account, $edit);
  $form_state['user'] = $account;
  $form_state['values']['uid'] = $account->uid;

  //Make the redirection
  $form_state['redirect'] = 'user/' . $account->uid . '/edit?registration=1&destination=blahblah'; 
}

Don't forget to check all the other pieces in the login toboggan's function to not forget any important part.

Answer 2

Login Toboggan has an option for this whereby you can use %uid as an argument for the redirect URL.

Literally a text box where you'd type /user/!uid/edit

It's also got a whole host of awesome features that are worth checking out :)

Answer 3

I think the better option you have is using the Rules module, rather than altering the form.