/**
* Get mark of a quiz for an user
*
* @param $quiz_id
*
* @return int
*/
function get_quiz_mark($quiz_id)
{
$quiz_questions = get_post_meta($quiz_id, '_lpr_quiz_questions', true);
$mark = 0;
if (!$quiz_questions) {
foreach ($quiz_questions as $question) {
$correct_answer = get_post_meta($question, '_lpr_question_correct_answer', true);
$question_mark = get_post_meta($question, '_lpr_question_mark', true);
$student_answer = lpr_get_question_answer($quiz_id, $question);
if (array_key_exists($question, $student_answer)) {
if ($correct_answer == $student_answer) {
$mark += $question_mark;
}
}
}
}
return $mark;
}
/**
* Finish quiz
*/
public static function finish_quiz()
{
$user_id = get_current_user_id();
$quiz_id = $_POST['quiz_id'];
$question_id = $_POST['question_id'];
$question_answer = $_POST['question_answer'];
// save current answer as if user may change
lpr_save_question_answer($quiz_id, $question_id, $question_answer);
// Show result to frontend
$quiz_id = $_POST['quiz_id'];
$quiz_questions = get_post_meta($quiz_id, '_lpr_quiz_questions', true);
$mark = 0;
if ($quiz_questions) {
foreach ($quiz_questions as $question) {
$correct_answer = get_post_meta($question, '_lpr_question_correct_answer', true);
$question_mark = get_post_meta($question, '_lpr_question_mark', true);
$student_answer = lpr_get_question_answer($quiz_id, $question_id);
if (array_key_exists($question, $student_answer)) {
if ($correct_answer == $student_answer) {
$mark += $question_mark;
}
}
}
}
// add this quiz to list of completed quizzes
$quiz_completed = get_user_meta($user_id, '_lpr_quiz_completed', true);
if ($quiz_completed) {
if (!isset($quiz_completed[$quiz_id]) || !is_array($quiz_completed[$quiz_id])) {
$quiz_completed[$quiz_id] = array();
}
array_push($quiz_completed[$quiz_id], $mark);
update_user_meta($user_id, '_lpr_quiz_completed', $quiz_completed);
} else {
$quiz_completed = array();
if (!isset($quiz_completed[$quiz_id]) || !is_array($quiz_completed[$quiz_id])) {
$quiz_completed[$quiz_id] = array();
}
array_push($quiz_completed[$quiz_id], $mark);
update_user_meta($user_id, '_lpr_quiz_completed', $quiz_completed);
}
$retake = get_user_meta($user_id, '_lpr_quiz_retake', true);
if (isset($retake) && is_array($retake)) {
$key = array_search($quiz_id, $retake);
if ($key !== false) {
unset($retake[$key]);
update_user_meta($user_id, '_lpr_quiz_retake', $retake);
}
}
die;
}
