signup_user example

function validate_user_signup() {
    $result     = validate_user_form();
    $user_name  = $result['user_name'];
    $user_email = $result['user_email'];
    $errors     = $result['errors'];

    if ( $errors->has_errors() ) {
        signup_user( $user_name, $user_email, $errors );
        return false;
    }

    if ( 'blog' === $_POST['signup_for'] ) {
        signup_blog( $user_name, $user_email );
        return false;
    }

    /** This filter is documented in wp-signup.php */
    wpmu_signup_user( $user_name, $user_email, apply_filters( 'add_signup_meta', array() ) );