learndash_quiz_remove_user_statistics_by_ref learndash_quiz_remove_user_statistics_by_ref( int $ref_id ) Removes the user quiz statistics by the reference ID. ContentsDescription Parameters Source Related Uses Used By Description # Parameters # $ref_id (int) (Optional) Quiz statistic reference ID. Default 0. Source # File: includes/course/ld-course-progress.php Related # Uses # Uses Uses Description includes/class-ldlms-db.php: LDLMS_DB::get_table_name () Utility function to return the table name. This is to prevent hard-coding of the table names throughout the code files. Used By # Used By Used By Description includes/course/ld-course-progress.php: learndash_remove_user_quiz_attempt () Removes the quiz attempt meta for a given user.