gistfile1.txt

add_action('user_register', 'handle_user_register', 10, 1);
function handle_user_register($user_id) {
  /*
  * When a new user registers, write all POST values to user_meta.
  * This way, they're accessible on when the new-user email is sent through wp_mail.
  * Otherwise values like first & last name aren't accessible in the email
  */
  foreach ($_POST as $key => $val) {
    update_user_meta($user_id, $key, $_POST[$key]);
  }
}