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function register_new_user( $user_login, $user_email ) {
  $errors = new WP_Error();

  $sanitized_user_login = sanitize_user( $user_login );
  
/**
 * Filters the email address of a user being registered.
 *
 * @since 2.1.0
 *
 * @param string $user_email The email address of the new user.
 */
  $user_email = apply_filters( 'user_registration_email', $user_email );

  // Check the username.
  if ( '' === $sanitized_user_login ) {
    $errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) );
  } elseif ( ! validate_username( $user_login ) ) {
    $errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) );
    $sanitized_user_login = '';
  } elseif ( username_exists( $sanitized_user_login ) ) {
    $errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) );

  } else {
    
/** This filter is documented in wp-includes/user.php */
    $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() );
    if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) {
      $errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) );
    }
  }

  // Check the email address.
  if ( '' === $user_email ) {
    $errors->add( 'empty_email', __( '<strong>Error:</strong> Please type your email address.' ) );
  } elseif ( ! is_email( $user_email ) ) {
    $errors->add( 'invalid_email', __( '<strong>Error:</strong> The email address is not correct.' ) );
    $user_email = '';
  } elseif ( email_exists( $user_email ) ) {
    $errors->add(
      'email_exists',
      sprintf(
        /* translators: %s: Link to the login page. */
        __( '<strong>Error:</strong> This email address is already registered. <a href="%s">Log in</a> with this address or choose another one.' ),
        wp_login_url()
      )
    );
  }

  
/**
 * Fires when submitting registration form data, before the user is created.
 *
 * @since 2.1.0
 *
 * @param string   $sanitized_user_login The submitted username after being sanitized.
 * @param string   $user_email           The submitted email.
 * @param WP_Error $errors               Contains any errors with submitted username and email,
 *                                       e.g., an empty field, an invalid username or email,
 *                                       or an existing username or email.
 */
  do_action( 'register_post', $sanitized_user_login, $user_email, $errors );

  
/**
 * Filters the errors encountered when a new user is being registered.
 *
 * The filtered WP_Error object may, for example, contain errors for an invalid
 * or existing username or email address. A WP_Error object should always be returned,
 * but may or may not contain errors.
 *
 * If any errors are present in $errors, this will abort the user's registration.
 *
 * @since 2.1.0
 *
 * @param WP_Error $errors               A WP_Error object containing any errors encountered
 *                                       during registration.
 * @param string   $sanitized_user_login User's username after it has been sanitized.
 * @param string   $user_email           User's email.
 */
  $errors = apply_filters( 'registration_errors', $errors, $sanitized_user_login, $user_email );

  if ( $errors->has_errors() ) {
    return $errors;
  }

  $user_pass = wp_generate_password( 12, false );
  $user_id   = wp_create_user( $sanitized_user_login, $user_pass, $user_email );
  if ( ! $user_id || is_wp_error( $user_id ) ) {
    $errors->add(
      'registerfail',
      sprintf(
        /* translators: %s: Admin email address. */
        __( '<strong>Error:</strong> Could not register you&hellip; please contact the <a href="mailto:%s">site admin</a>!' ),
        get_option( 'admin_email' )
      )
    );
    return $errors;
  }

  update_user_meta( $user_id, 'default_password_nag', true ); // Set up the password change nag.

  if ( ! empty( $_COOKIE['wp_lang'] ) ) {
    $wp_lang = sanitize_text_field( $_COOKIE['wp_lang'] );
    if ( in_array( $wp_lang, get_available_languages(), true ) ) {
      update_user_meta( $user_id, 'locale', $wp_lang ); // Set user locale if defined on registration.
    }
  }

  
/**
 * Fires after a new user registration has been recorded.
 *
 * @since 4.4.0
 *
 * @param int $user_id ID of the newly registered user.
 */
  do_action( 'register_new_user', $user_id );

  return $user_id;
}