public function get_attempts_remaining_for_quiz( $quiz_id, $allow_negative = false ) {

		$quiz = llms_get_post( $quiz_id );

		$ret = _x( 'Unlimited', 'quiz attempts remaining', 'lifterlms' );

		if ( $quiz->has_attempt_limit() ) {

			$allowed = $quiz->get( 'allowed_attempts' );
			$used    = $this->count_attempts_by_quiz( $quiz->get( 'id' ) );

			// Ensure undefined, null, '', etc. show as an int.
			if ( ! $allowed ) {
				$allowed = 0;
			}

			$remaining = ( $allowed - $used );

			// Don't show negative attempts.
			$ret = $allow_negative ? $remaining : max( 0, $remaining );

		}

		/**
		 * Filters the number of attempts remaining by a student for a given quiz.
		 *
		 * @since 3.16.0
		 *
		 * @param mixed                $ret             The number of attempts remaining by a student for a given quiz,
		 *                                              or 'Unlimited' for quizzes with no attempts limit.
		 * @param LLMS_Quiz            $quiz            Quiz object.
		 * @param LLMS_Student_Quizzes $student_quizzes Student quizzes object.
		 */
		return apply_filters( 'llms_student_quiz_attempts_remaining_for_quiz', $ret, $quiz, $this );

	}