Form_Frontend_Submission_Handler::set_form_error( awsmug\Torro_Forms\DB_Objects\Forms\Form $form, WP_Error $error )

	protected function set_form_error( $form, $error ) {
		$key = $this->form_manager->get_prefix() . 'form_errors';

		if ( is_user_logged_in() ) {
			$errors = get_user_meta( get_current_user_id(), $key, true );

			if ( ! is_array( $errors ) ) {
				$errors = array();
			}

			$errors[ $form->id ] = $error->get_error_message();

			return (bool) update_user_meta( get_current_user_id(), $key, $errors );
		}

		if ( ! isset( $_SESSION ) ) {
			if ( headers_sent() ) {
				return false;
			}

			session_start();
		}

		if ( ! isset( $_SESSION[ $key ] ) ) {
			$_SESSION[ $key ] = array();
		}

		$_SESSION[ $key ][ $form->id ] = $error->get_error_message();

		return true;
	}