Chamilo is a learning management system focused on ease of use and accessibility
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chamilo-lms/main/exercice/answer.class.php

599 lines
18 KiB

<?php
/* For licensing terms, see /license.txt */
/**
* This class allows to instantiate an object of type Answer
* 5 arrays are created to receive the attributes of each answer belonging to a specified question
* @package chamilo.exercise
* @author Olivier Brouckaert
* @version $Id: answer.class.php 21172 2009-06-01 20:58:05Z darkvela $
*/
/**
* Code
*/
if(!class_exists('Answer')):
/**
* Answer class
* @package chamilo.exercise
*/
class Answer {
public $questionId;
// these are arrays
public $answer;
public $correct;
public $comment;
public $weighting;
public $position;
public $hotspot_coordinates;
public $hotspot_type;
public $destination;
// these arrays are used to save temporarily new answers
// then they are moved into the arrays above or deleted in the event of cancellation
public $new_answer;
public $new_correct;
public $new_comment;
public $new_weighting;
public $new_position;
public $new_hotspot_coordinates;
public $new_hotspot_type;
public $nbrAnswers;
public $new_nbrAnswers;
public $new_destination; // id of the next question if feedback option is set to Directfeedback
public $course; //Course information
/**
* constructor of the class
*
* @author Olivier Brouckaert
* @param integer Question ID that answers belong to
*/
function Answer($questionId, $course_id = null) {
$this->questionId = intval($questionId);
$this->answer = array();
$this->correct = array();
$this->comment = array();
$this->weighting = array();
$this->position = array();
$this->hotspot_coordinates = array();
$this->hotspot_type = array();
$this->destination = array();
// clears $new_* arrays
$this->cancel();
if (!empty($course_id)) {
$this->course_id = intval($course_id);
$course_info = api_get_course_info_by_id($this->course_id);
} else {
$course_info = api_get_course_info();
}
$this->course = $course_info;
// fills arrays
$objExercise = new Exercise($this->course['real_id']);
$objExercise->read($_REQUEST['exerciseId']);
if ($objExercise->random_answers=='1') {
$this->readOrderedBy('rand()', '');// randomize answers
} else {
$this->read(); // natural order
}
}
/**
* Clears $new_* arrays
*
* @author - Olivier Brouckaert
*/
function cancel() {
$this->new_answer = array();
$this->new_correct = array();
$this->new_comment = array();
$this->new_weighting = array();
$this->new_position = array();
$this->new_hotspot_coordinates = array();
$this->new_hotspot_type = array();
$this->new_nbrAnswers = 0;
$this->new_destination = array();
}
/**
* Reads answer informations from the data base
*
* @author - Olivier Brouckaert
*/
function read() {
$TBL_ANSWER = Database::get_course_table(TABLE_QUIZ_ANSWER, $this->course['db_name']);
$questionId=$this->questionId;
//$answerType=$this->selectType();
$sql="SELECT id,answer,correct,comment,ponderation, position, hotspot_coordinates, hotspot_type, destination, id_auto FROM
$TBL_ANSWER WHERE question_id ='".$questionId."' ORDER BY position";
$result=Database::query($sql);
$i=1;
// while a record is found
while($object=Database::fetch_object($result)) {
$this->id[$i] = $object->id;
$this->answer[$i] = $object->answer;
$this->correct[$i] = $object->correct;
$this->comment[$i] = $object->comment;
$this->weighting[$i] = $object->ponderation;
$this->position[$i] = $object->position;
$this->hotspot_coordinates[$i] = $object->hotspot_coordinates;
$this->hotspot_type[$i] = $object->hotspot_type;
$this->destination[$i] = $object->destination;
$this->autoId[$i] = $object->id_auto;
$i++;
}
$this->nbrAnswers=$i-1;
}
/**
* reads answer informations from the data base ordered by parameter
* @param string Field we want to order by
* @param string DESC or ASC
* @author Frederic Vauthier
*/
function readOrderedBy($field,$order='ASC') {
$field = Database::escape_string($field);
if (empty($field)) {
$field = 'position';
}
if ($order != 'ASC' && $order!='DESC') {
$order = 'ASC';
}
$TBL_ANSWER = Database::get_course_table(TABLE_QUIZ_ANSWER, $this->course['db_name']);
$TBL_QUIZ= Database::get_course_table(TABLE_QUIZ_QUESTION, $this->course['db_name']);
$questionId=intval($this->questionId);
$sql = "SELECT type FROM $TBL_QUIZ where id = $questionId";
$result_question=Database::query($sql);
$question_type=Database::fetch_array($result_question);
$remove_doubt_answer = ''; //
$sql="SELECT answer,correct,comment,ponderation,position, hotspot_coordinates, hotspot_type, destination, id_auto " .
"FROM $TBL_ANSWER WHERE question_id='".$questionId."' " .
"ORDER BY $field $order";
$result=Database::query($sql);
$i=1;
// while a record is found
$doubt_data = null;
while($object=Database::fetch_object($result)) {
if ($question_type['type'] == UNIQUE_ANSWER_NO_OPTION && $object->position == 666) {
$doubt_data = $object;
continue;
}
$this->answer[$i] = $object->answer;
$this->correct[$i] = $object->correct;
$this->comment[$i] = $object->comment;
$this->weighting[$i] = $object->ponderation;
$this->position[$i] = $object->position;
$this->destination[$i] = $object->destination;
$this->autoId[$i] = $object->id_auto;
$i++;
}
if ($question_type['type'] == UNIQUE_ANSWER_NO_OPTION && !empty($doubt_data)) {
$this->answer[$i] = $doubt_data->answer;
$this->correct[$i] = $doubt_data->correct;
$this->comment[$i] = $doubt_data->comment;
$this->weighting[$i] = $doubt_data->ponderation;
$this->position[$i] = $doubt_data->position;
$this->destination[$i] = $doubt_data->destination;
$this->autoId[$i] = $doubt_data->id_auto;
$i++;
}
$this->nbrAnswers=$i-1;
}
/**
* returns the autoincrement id identificator
*
* @author - Juan Carlos Ra<EFBFBD>a
* @return - integer - answer num
*/
function selectAutoId($id)
{
return $this->autoId[$id];
}
/**
* returns the number of answers in this question
*
* @author - Olivier Brouckaert
* @return - integer - number of answers
*/
function selectNbrAnswers()
{
return $this->nbrAnswers;
}
/**
* returns the question ID which the answers belong to
*
* @author - Olivier Brouckaert
* @return - integer - the question ID
*/
function selectQuestionId()
{
return $this->questionId;
}
/**
* returns the question ID of the destination question
*
* @author - Julio Montoya
* @return - integer - the question ID
*/
function selectDestination($id)
{
return $this->destination[$id];
}
/**
* returns the answer title
*
* @author - Olivier Brouckaert
* @param - integer $id - answer ID
* @return - string - answer title
*/
function selectAnswer($id)
{
return $this->answer[$id];
}
/**
* return array answer by id else return a bool
*/
function selectAnswerByAutoId($auto_id) {
$TBL_ANSWER = Database::get_course_table(TABLE_QUIZ_ANSWER, $this->course['db_name']);
$auto_id = intval($auto_id);
$sql="SELECT id, answer FROM $TBL_ANSWER WHERE id_auto='$auto_id'";
$rs = Database::query($sql);
if (Database::num_rows($rs)>0) {
$row = Database::fetch_array($rs);
return $row;
}
return false;
}
/**
* returns the answer title from an answer's position
*
* @author - Yannick Warnier
* @param - integer $id - answer ID
* @return - bool - answer title
*/
function selectAnswerIdByPosition($pos) {
foreach ($this->position as $k => $v) {
if ($v != $pos) { continue; }
return $k;
}
return false;
}
/**
* Returns a list of answers
* @author Yannick Warnier <ywarnier@beeznest.org>
* @return array List of answers where each answer is an array of (id, answer, comment, grade) and grade=weighting
*/
function getAnswersList($decode = false) {
$list = array();
for($i = 1; $i<=$this->nbrAnswers;$i++){
if(!empty($this->answer[$i])){
//Avoid problems when parsing elements with accents
if ($decode) {
$this->answer[$i] = api_html_entity_decode($this->answer[$i], ENT_QUOTES, api_get_system_encoding());
$this->comment[$i] = api_html_entity_decode($this->comment[$i], ENT_QUOTES, api_get_system_encoding());
}
$list[] = array(
'id'=>$i,
'answer'=>$this->answer[$i],
'comment'=>$this->comment[$i],
'grade' => $this->weighting[$i],
'hotspot_coord' => $this->hotspot_coordinates[$i],
'hotspot_type' => $this->hotspot_type[$i],
'correct' => $this->correct[$i],
'destination' => $this->destination[$i]
);
}
}
return $list;
}
/**
* Returns a list of grades
* @author Yannick Warnier <ywarnier@beeznest.org>
* @return array List of grades where grade=weighting (?)
*/
function getGradesList()
{
$list = array();
for($i = 0; $i<$this->nbrAnswers;$i++){
if(!empty($this->answer[$i])){
$list[$i] = $this->weighting[$i];
}
}
return $list;
}
/**
* Returns the question type
* @author Yannick Warnier <ywarnier@beeznest.org>
* @return integer The type of the question this answer is bound to
*/
function getQuestionType()
{
$TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION, $this->course['db_name']);
$sql = "SELECT type FROM $TBL_QUESTIONS WHERE id = '".$this->questionId."'";
$res = Database::query($sql);
if(Database::num_rows($res)<=0){
return null;
}
$row = Database::fetch_array($res);
return $row['type'];
}
/**
* tells if answer is correct or not
*
* @author - Olivier Brouckaert
* @param - integer $id - answer ID
* @return - integer - 0 if bad answer, not 0 if good answer
*/
function isCorrect($id)
{
return $this->correct[$id];
}
/**
* returns answer comment
*
* @author - Olivier Brouckaert
* @param - integer $id - answer ID
* @return - string - answer comment
*/
function selectComment($id)
{
return $this->comment[$id];
}
/**
* returns answer weighting
*
* @author - Olivier Brouckaert
* @param - integer $id - answer ID
* @return - integer - answer weighting
*/
function selectWeighting($id)
{
return $this->weighting[$id];
}
/**
* returns answer position
*
* @author - Olivier Brouckaert
* @param - integer $id - answer ID
* @return - integer - answer position
*/
function selectPosition($id)
{
return $this->position[$id];
}
/**
* returns answer hotspot coordinates
*
* @author Olivier Brouckaert
* @param integer Answer ID
* @return integer Answer position
*/
function selectHotspotCoordinates($id)
{
return $this->hotspot_coordinates[$id];
}
/**
* returns answer hotspot type
*
* @author Toon Keppens
* @param integer Answer ID
* @return integer Answer position
*/
function selectHotspotType($id)
{
return $this->hotspot_type[$id];
}
/**
* creates a new answer
*
* @author Olivier Brouckaert
* @param string answer title
* @param integer 0 if bad answer, not 0 if good answer
* @param string answer comment
* @param integer answer weighting
* @param integer answer position
* @param coordinates Coordinates for hotspot exercises (optional)
* @param integer Type for hotspot exercises (optional)
*/
function createAnswer($answer,$correct,$comment,$weighting,$position,$new_hotspot_coordinates = NULL, $new_hotspot_type = NULL,$destination='')
{
$this->new_nbrAnswers++;
$id=$this->new_nbrAnswers;
$this->new_answer[$id]=$answer;
$this->new_correct[$id]=$correct;
$this->new_comment[$id]=$comment;
$this->new_weighting[$id]=$weighting;
$this->new_position[$id]=$position;
$this->new_hotspot_coordinates[$id]=$new_hotspot_coordinates;
$this->new_hotspot_type[$id]=$new_hotspot_type;
$this->new_destination[$id]=$destination;
}
/**
* updates an answer
*
* @author Toon Keppens
* @param string Answer title
* @param string Answer comment
* @param integer Answer weighting
* @param integer Answer position
*/
function updateAnswers($answer,$comment,$weighting,$position,$destination)
{
$TBL_REPONSES = Database :: get_course_table(TABLE_QUIZ_ANSWER, $this->course['db_name']);
$questionId=$this->questionId;
$sql = "UPDATE $TBL_REPONSES SET " .
"answer = '".Database::escape_string($answer)."', " .
"comment = '".Database::escape_string($comment)."', " .
"ponderation = '".Database::escape_string($weighting)."', " .
"position = '".Database::escape_string($position)."', " .
"destination = '".Database::escape_string($destination)."' " .
"WHERE id = '".Database::escape_string($position)."' " .
"AND question_i = '".Database::escape_string($questionId)."'";
Database::query($sql);
}
/**
* Records answers into the data base
*
* @author - Olivier Brouckaert
*/
function save() {
$TBL_REPONSES = Database :: get_course_table(TABLE_QUIZ_ANSWER, $this->course['db_name']);
$questionId=$this->questionId;
// removes old answers before inserting of new ones
$sql="DELETE FROM $TBL_REPONSES WHERE question_id='".Database::escape_string($questionId)."'";
Database::query($sql);
// inserts new answers into data base
$sql="INSERT INTO $TBL_REPONSES" .
"(id,question_id,answer,correct,comment," .
"ponderation,position,hotspot_coordinates,hotspot_type,destination) VALUES";
for($i=1;$i <= $this->new_nbrAnswers;$i++) {
$answer = Database::escape_string($this->new_answer[$i]);
$correct = Database::escape_string($this->new_correct[$i]);
$comment = Database::escape_string($this->new_comment[$i]);
$weighting = Database::escape_string($this->new_weighting[$i]);
$position = Database::escape_string($this->new_position[$i]);
$hotspot_coordinates = Database::escape_string($this->new_hotspot_coordinates[$i]);
$hotspot_type = Database::escape_string($this->new_hotspot_type[$i]);
$destination = Database::escape_string($this->new_destination[$i]);
$sql.="('$i','$questionId','$answer','$correct','$comment',
'$weighting','$position','$hotspot_coordinates','$hotspot_type','$destination'),";
}
$sql = api_substr($sql,0,-1);
Database::query($sql);
// moves $new_* arrays
$this->answer=$this->new_answer;
$this->correct=$this->new_correct;
$this->comment=$this->new_comment;
$this->weighting=$this->new_weighting;
$this->position=$this->new_position;
$this->hotspot_coordinates=$this->new_hotspot_coordinates;
$this->hotspot_type=$this->new_hotspot_type;
$this->nbrAnswers=$this->new_nbrAnswers;
$this->destination=$this->new_destination;
// clears $new_* arrays
$this->cancel();
}
/**
* Duplicates answers by copying them into another question
*
* @author Olivier Brouckaert
* @param int question id
* @param array course info (result of the function api_get_course_info() )
*/
function duplicate($newQuestionId, $course_info = null) {
require_once api_get_path(LIBRARY_PATH).'document.lib.php';
if (empty($course_info)) {
$course_info = $this->course;
} else {
$course_info = $course_info;
}
$TBL_REPONSES = Database :: get_course_table(TABLE_QUIZ_ANSWER, $course_info['db_name']);
if (self::getQuestionType() == MULTIPLE_ANSWER_TRUE_FALSE) {
//Selecting origin options
$origin_options = Question::readQuestionOption($this->selectQuestionId(),$this->course['db_name']);
//var_dump($origin_options);
if (!empty($origin_options)) {
foreach($origin_options as $item) {
$new_option_list[]=$item['id'];
}
}
$destination_options = Question::readQuestionOption($newQuestionId,$course_info['db_name']);
$i=0;
$fixed_list = array();
if (!empty($destination_options)) {
foreach($destination_options as $item) {
$fixed_list[$new_option_list[$i]] = $item['id'];
$i++;
}
}
//var_dump($fixed_list);
}
// if at least one answer
if ($this->nbrAnswers) {
// inserts new answers into data base
$sql="INSERT INTO $TBL_REPONSES (id,question_id,answer,correct,comment, ponderation,position,hotspot_coordinates,hotspot_type,destination) VALUES";
for($i=1;$i <= $this->nbrAnswers;$i++) {
if ($course_info['db_name'] != $this->course['db_name']) {
$this->answer[$i] = DocumentManager::replace_urls_inside_content_html_from_copy_course($this->answer[$i],$this->course['id'], $course_info['id']) ;
$this->comment[$i] = DocumentManager::replace_urls_inside_content_html_from_copy_course($this->comment[$i],$this->course['id'], $course_info['id']) ;
}
$answer = Database::escape_string($this->answer[$i]);
$correct = Database::escape_string($this->correct[$i]);
if (self::getQuestionType() == MULTIPLE_ANSWER_TRUE_FALSE) {
$correct = $fixed_list[intval($correct)];
}
$comment = Database::escape_string($this->comment[$i]);
$weighting = Database::escape_string($this->weighting[$i]);
$position = Database::escape_string($this->position[$i]);
$hotspot_coordinates = Database::escape_string($this->hotspot_coordinates[$i]);
$hotspot_type = Database::escape_string($this->hotspot_type[$i]);
$destination = Database::escape_string($this->destination[$i]);
$sql.="('$i','$newQuestionId','$answer','$correct','$comment'," .
"'$weighting','$position','$hotspot_coordinates','$hotspot_type','$destination'),";
}
$sql=api_substr($sql,0,-1);
Database::query($sql);
}
}
}
endif;