woothemes / sensei

         $comment_meta_id = Sensei_Utils::add_user_data( 'quiz_grades', $lesson_id, $quiz_grades, $user_id   );

         // were the grades save successfully ?

         if( intval( $comment_meta_id ) > 0 ) {

             $success = true;

             // save transient

             $transient_key = 'quiz_grades_'. $user_id . '_' . $lesson_id;

             set_transient( $transient_key, $quiz_grades, 10 * DAY_IN_SECONDS );

         }

         return $success;

        $feedback_saved = Sensei_Utils::add_user_data( 'quiz_answers_feedback', $lesson_id , $encoded_answers_feedback, $user_id ) ;

        //Were the the question feedback save correctly?

        if( intval( $feedback_saved ) > 0){

            // save transient to make retrieval faster in future

             $transient_key = 'sensei_answers_feedback_'.$user_id.'_'.$lesson_id;

             set_transient( $transient_key, $encoded_answers_feedback, 10 * DAY_IN_SECONDS );

        }

        return $feedback_saved;