LearnDash cloze answer accept case sensitive

learndash-code-in-answer.php

<?php 
/**
 * LearnDash filter to prevent converting answer values to lowercase
 *
 * @possibly use ld_adv_quiz_pro_ajax() 
 * @uses stripslashes( strtolower( trim( $userResponse ) ) ) Default
 * @since 1.0
 * @from WpProQuiz_View_FrontQuiz.php
 * post_type=sfwd-quiz
 */

//Prevent LearnDash from converting the answer before we get it
add_filter('learndash_quiz_question_cloze_answers_to_lowercase', '__return_false' );

//Here's our cut
function kiancode_learndash_quiz_recheck_using_original( $checked, $type, $answer,  $correctArray, $answerIndex, $questionModel )
{
    $shortcode='[code]';
    $has_shortcode = strpos($questionModel->getAnswerData(true), $shortcode);
    if( $has_shortcode)
    {
        return in_array( $answer, $correctArray );
    }

    $lower_correct=array_map('strtolower', $correctArray);
    $lower_answer=strtolower($answer);

    return in_array($lower_answer, $lower_correct);

}

add_filter( 'learndash_quiz_check_answer', 'kiancode_learndash_quiz_recheck_using_original', 15, 6 );