public function check_answer()
{
global $DB, $CFG, $PAGE;
$result = parent::check_answer();
$formattextdefoptions = new stdClass();
$formattextdefoptions->noclean = true;
$formattextdefoptions->para = false;
$answers = $this->get_used_answers();
shuffle($answers);
$action = $CFG->wwwroot . '/mod/lesson/continue.php';
$params = array('answers' => $answers, 'lessonid' => $this->lesson->id, 'contents' => $this->get_contents());
if ($this->properties->qoption) {
$mform = new lesson_display_answer_form_multichoice_multianswer($action, $params);
} else {
$mform = new lesson_display_answer_form_multichoice_singleanswer($action, $params);
}
$data = $mform->get_data();
require_sesskey();
if (!$data) {
redirect(new moodle_url('/mod/lesson/view.php', array('id' => $PAGE->cm->id, 'pageid' => $this->properties->id)));
}
if ($this->properties->qoption) {
// MULTIANSWER allowed, user's answer is an array
if (empty($data->answer) || !is_array($data->answer)) {
$result->noanswer = true;
return $result;
}
$studentanswers = array();
foreach ($data->answer as $key => $value) {
$studentanswers[] = (int) $key;
}
// get what the user answered
$result->userresponse = implode(",", $studentanswers);
// get the answers in a set order, the id order
$answers = $this->get_used_answers();
$ncorrect = 0;
$nhits = 0;
$correctresponse = '';
$wrongresponse = '';
$correctanswerid = 0;
$wronganswerid = 0;
// store student's answers for displaying on feedback page
$result->studentanswer = '';
foreach ($answers as $answer) {
foreach ($studentanswers as $answerid) {
if ($answerid == $answer->id) {
$result->studentanswer .= '<br />' . format_text($answer->answer, $answer->answerformat, $formattextdefoptions);
}
}
}
$correctpageid = null;
$wrongpageid = null;
// this is for custom scores. If score on answer is positive, it is correct
if ($this->lesson->custom) {
$ncorrect = 0;
$nhits = 0;
foreach ($answers as $answer) {
if ($answer->score > 0) {
$ncorrect++;
foreach ($studentanswers as $answerid) {
if ($answerid == $answer->id) {
$nhits++;
}
}
// save the first jumpto page id, may be needed!...
if (!isset($correctpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$correctpageid = $answer->jumpto;
}
// save the answer id for scoring
if ($correctanswerid == 0) {
$correctanswerid = $answer->id;
}
// ...also save any response from the correct answers...
if (trim(strip_tags($answer->response))) {
$correctresponse = format_text($answer->response, $answer->responseformat, $formattextdefoptions);
}
} else {
// save the first jumpto page id, may be needed!...
if (!isset($wrongpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$wrongpageid = $answer->jumpto;
}
// save the answer id for scoring
if ($wronganswerid == 0) {
$wronganswerid = $answer->id;
}
// ...and from the incorrect ones, don't know which to use at this stage
if (trim(strip_tags($answer->response))) {
$wrongresponse = format_text($answer->response, $answer->responseformat, $formattextdefoptions);
}
}
}
} else {
foreach ($answers as $answer) {
if ($this->lesson->jumpto_is_correct($this->properties->id, $answer->jumpto)) {
$ncorrect++;
foreach ($studentanswers as $answerid) {
if ($answerid == $answer->id) {
$nhits++;
}
}
// save the first jumpto page id, may be needed!...
if (!isset($correctpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$correctpageid = $answer->jumpto;
}
// save the answer id for scoring
if ($correctanswerid == 0) {
$correctanswerid = $answer->id;
}
// ...also save any response from the correct answers...
if (trim(strip_tags($answer->response))) {
$correctresponse = format_text($answer->response, $answer->responseformat, $formattextdefoptions);
}
} else {
// save the first jumpto page id, may be needed!...
if (!isset($wrongpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$wrongpageid = $answer->jumpto;
}
// save the answer id for scoring
if ($wronganswerid == 0) {
$wronganswerid = $answer->id;
}
// ...and from the incorrect ones, don't know which to use at this stage
if (trim(strip_tags($answer->response))) {
$wrongresponse = format_text($answer->response, $answer->responseformat, $formattextdefoptions);
}
}
}
}
if (count($studentanswers) == $ncorrect and $nhits == $ncorrect) {
$result->correctanswer = true;
$result->response = $correctresponse;
$result->newpageid = $correctpageid;
$result->answerid = $correctanswerid;
} else {
$result->response = $wrongresponse;
$result->newpageid = $wrongpageid;
$result->answerid = $wronganswerid;
}
} else {
// only one answer allowed
if (empty($data->answerid) && !is_int($data->answerid)) {
$result->noanswer = true;
return $result;
}
$result->answerid = $data->answerid;
if (!($answer = $DB->get_record("lesson_answers", array("id" => $result->answerid)))) {
print_error("Continue: answer record not found");
}
if ($this->lesson->jumpto_is_correct($this->properties->id, $answer->jumpto)) {
$result->correctanswer = true;
}
if ($this->lesson->custom) {
if ($answer->score > 0) {
$result->correctanswer = true;
} else {
$result->correctanswer = false;
}
}
$result->newpageid = $answer->jumpto;
$result->response = format_text($answer->response, $answer->responseformat, $formattextdefoptions);
$result->userresponse = format_text($answer->answer, $answer->answerformat, $formattextdefoptions);
$result->studentanswer = $result->userresponse;
}
return $result;
}
