/**
  * Change the correct answer after the question has been locked. Update user marks in summative log table
  * @param mixed $new_correct Array of new values for fields that can be corrected
  * @param integer $paper_id
  * @param boolean $changes True if changes have been made by a previous corrector
  * @param integer $paper_type Integer index for type of paper
  * @return array[$string] Any errors encountered in the correction process
  */
 public function execute($new_correct, $paper_id, &$changes, $paper_type)
 {
     $errors = array();
     $marks_correct = $this->_question->get_marks_correct();
     $marks_incorrect = $this->_question->get_marks_incorrect();
     $marks_partial = $this->_question->get_marks_partial();
     $tolerance_full = $this->_question->get_tolerance_full();
     if ($tolerance_full != $new_correct['tolerance_full']) {
         $this->_question->set_tolerance_full($new_correct['tolerance_full']);
         $changes = true;
         $this->_question->add_unified_field_modification('tolerance_full', 'tolerance_full', $tolerance_full, $new_correct['tolerance_full'], $this->_lang_strings['postexamchange']);
     }
     $tolerance_partial = $this->_question->get_tolerance_partial();
     if ($tolerance_partial != $new_correct['tolerance_partial']) {
         $this->_question->set_tolerance_partial($new_correct['tolerance_partial']);
         $changes = true;
         $this->_question->add_unified_field_modification('tolerance_partial', 'tolerance_partial', $tolerance_partial, $new_correct['tolerance_partial'], $this->_lang_strings['postexamchange']);
     }
     $answer_precision = $this->_question->get_answer_precision();
     if ($answer_precision != $new_correct['answer_precision']) {
         $this->_question->set_answer_precision($new_correct['answer_precision']);
         $changes = true;
         $this->_question->add_unified_field_modification('answer_precision', 'answer_precision', $answer_precision, $new_correct['answer_precision'], $this->_lang_strings['postexamchange']);
     }
     $strict_zeros = $this->_question->get_strict_zeros();
     // Need to be careful of how the correction code builds the values for check boxes
     if (isset($new_correct['strict_zeros'])) {
         $new_strict_zeros = is_array($new_correct['strict_zeros']) ? $new_correct['strict_zeros'][0] : $new_correct['strict_display'];
     } else {
         $new_strict_zeros = false;
     }
     if ($strict_zeros != $new_strict_zeros) {
         $this->_question->set_strict_zeros($new_strict_zeros);
         $changes = true;
         $this->_question->add_unified_field_modification('strict_zeros', 'strict_zeros', $strict_zeros, $new_strict_zeros, $this->_lang_strings['postexamchange']);
     }
     // Parse answers
     $opts = $this->_question->options;
     for ($i = 1; $i <= $this->_question->max_options; $i++) {
         if (isset($opts[$i])) {
             $ans = $opts[$i]->get_formula();
             $units = $opts[$i]->get_units();
             if ($ans != '' and $new_correct['option_formula'][$i - 1] == '') {
                 $opts[$i]->set_formula('');
                 $opts[$i]->set_units('');
                 $changes = true;
                 $this->_question->add_unified_field_modification('Deleted Answer ' . $i, 'Deleted Answer ' . $i, $ans . ', ' . $units, '', $this->_lang_strings['postexamchange']);
             } else {
                 if ($ans != $new_correct['option_formula'][$i - 1]) {
                     $opts[$i]->set_formula($new_correct['option_formula'][$i - 1]);
                     $changes = true;
                     if ($ans != '') {
                         $this->_question->add_unified_field_modification('option_formula' . $i, 'option_formula' . $i, $ans, $new_correct['option_formula'][$i - 1], $this->_lang_strings['postexamchange']);
                     }
                 }
                 if ($units != $new_correct['option_units'][$i - 1]) {
                     $opts[$i]->set_units($new_correct['option_units'][$i - 1]);
                     $changes = true;
                     if ($ans != '') {
                         $this->_question->add_unified_field_modification('option_units' . $i, 'option_units' . $i, $units, $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
                     }
                 }
                 if ($ans == '') {
                     $this->_question->add_unified_field_modification('New Answer ' . $i, 'New Answer ' . $i, '', $new_correct['option_formula'][$i - 1] . ', ' . $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
                 }
             }
         } elseif ($new_correct['option_formula'][$i - 1] != '') {
             // Complete new answer
             $changes = true;
             $userObj = UserObject::get_instance();
             $this->_question->options[$i] = new OptionENHANCEDCALC($this->_mysqli, $userObj->get_user_ID(), $this->_question, $i, $this->_lang_strings, array('formula' => $new_correct['option_formula'][$i - 1], 'units' => $new_correct['option_units'][$i - 1]));
             $this->_question->add_unified_field_modification('New Answer ' . $i, 'New Answer ' . $i, '', $new_correct['option_formula'][$i - 1] . ', ' . $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
         }
     }
     if ($changes) {
         try {
             if (!$this->_question->save()) {
                 $errors[] = $this->_lang_strings['datasaveerror'];
             } else {
                 enhancedcalc_remark($paper_type, $paper_id, $this->_question->id, $this->_question->get_settings(), $this->_mysqli, 'all');
             }
         } catch (ValidationException $vex) {
             $errors[] = $vex->getMessage();
         }
         if (count($errors) == 0) {
             $this->invalidate_paper_cache($paper_id);
         }
     }
     return $errors;
 }
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    }
    $check_possible->close();
}
$server_connection = true;
$statuses = array();
// Should not get here but if we do throw a critical error.
if (count($q_ids) == 0) {
    // Critical error
    $error = true;
    $errline = __LINE__ - 3;
    $return_status = $string['noenhancedcalcdetected'];
} else {
    $return_status = 'Complete';
}
foreach ($q_ids as $q_id => $setting) {
    $data = enhancedcalc_remark($paper_type, $paperID, $q_id, $setting, $mysqli, 'all');
    if ($data[-3] > 0) {
        $server_connection = false;
    }
    $statuses[$q_id] = $data;
}
$problem_questions = array();
foreach ($statuses as $qid => $data) {
    if ($data[Q_MARKING_UNMARKED] > 0 or $data[Q_MARKING_ERROR] > 0) {
        // Record unmarked and marking error problems.
        $q_no = get_question_no($qid, $questions);
        // Use the is if we cannot find the number.
        // Most likely a random block / keyword based question.
        if ($q_no == '') {
            $q_no = 'qid: ' . $qid;
        }