register without email

Follow this thread:

http://lists.drupal.org/pipermail/development/2006-June/016823.html

Sorry to drag up an old thread but it seems that there was no solution to this. I am developing a site for people who have never used the internet (or are very new to it), so most will not have email addresses. I want to give people the option to register with either a mobile number or email address. The only way I have found of doing this is by writing my own registration module which saves a null to the mail field in the user table if no email address is entered. I would however prefer to be able to use the built in user module for registration, so if anyone has any ideas of a way of forcing it to accept a blank email address, please let me know!

Ok I've found a way of doing it. I re-used some code from the localemail module http://drupal.org/project/localemail (with some slight modification to make it work in Drupal 7):

Here are the main functions that do the work:

function noemail_menu()
{
    $items = array();

    $items['user/register/noemail'] = array(
        'title' => 'Register without an email',
        'description'  => 'Register without an email',
        'page callback' => 'noemail_page',
        'access arguments' => array('access content'),
        'type' => MENU_NORMAL_ITEM,
    );
    return $items;
}

function noemail_page()
{
    return drupal_get_form('user_register_form');
}

function noemail_form_alter(&$form, &$form_state, $form_id)
{
    global $user;
    switch ($form_id) {
        case 'user_register_form':
            if (arg(2)=='noemail')
            {
                $form['account']['mail']['#required'] = false;
                $form['#validate'][0] = 'my_user_register_validate2';
                $form['account']['mail']['#prefix'] = '<div style="display:none">';
                $form['account']['mail']['#suffix'] = '</div>';

                $form['mail']['#required'] = false;
                $form['mail']['#prefix'] = '<div style="display:none">';
                $form['mail']['#suffix'] = '</div>';
                break;
            }
    }
}

function my_user_register_validate2($form, &$form_state) {
  // if no email value, then stuff a temp one to fool the validation
  if ($form_state['values']['mail'] == null)
  // a unique non-existent email
  $form_state['values']['mail'] = 'nobody@nowhere.com';

  // call original system validation
  user_register_validate($form, $form_state);

  // stuff empty back again
  if ($form_state['values']['mail'] == 'nobody@nowhere.com')
  $form_state['values']['mail'] = '';
  return;
}