Hook into Drupal registration and validate user info against business logic

Question

I want to hook into the registration module. I already have a database of 50000 users who use my old website. Now I am migrating to Drupal.

I still haven\'t migrated the

Answer 1

Here are some examples for Drupal 7:

/**
 * Implements of hook_user_insert().
 */
function foo_user_insert(&$edit, $account, $category) {
  // foo_user_submit($edit, $account);
}

/**
 * Implementation of hook_user_delete().
 */
function foo_user_delete($account) {
  // foo_user_delete($account);
}

/**
 * Implements hook_form_FORM_ID_alter().
 * Form ID: user_register_form
 */
function foo_form_user_register_form_alter($form, &$form_state) {
  if ($form['#user_category'] == 'account' && !isset($form['#user']->uid)) {
    // Foo code
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 * Form ID: user_profile_form
 */
function foo_form_user_profile_form_alter($form, &$form_state) {
  // Set a custom form validate and submit handlers.
  $form['#validate'][] = 'foo_account_validate';
  $form['#submit'][] = 'foo_account_submit';
}

/**
 * Implements of hook_form_alter().
 * This is the same as: hook_form_FORM_ID_alter()
 */
function foo_form_alter(&$form, $form_state, $form_id) {
  switch ($form_id) {
    case "user_profile_form":
    case "user_register_form":
      break;
  }
}