cats/classes/Quiz.class.php

<?php

class Quiz
{
   var  $topicID;
   var  $questionLimit;
   var  $questionList;
   var  $answerList;
   var  $maxNumberOfAns;
   var  $selectedAnswers;
   var  $correct;
   var  $wrongQuestions;
   var  $lp_id;
   var  $rawToPass;
   var  $question;
   var  $percentTest;
   var  $testPassed;

   function Quiz(){
     $this->topicID=0;
     $this->questionLimit=0;
     $this->questionList= array();
     $this->answerList= array();
     $this->maxNumberOfAns=0;
     $this->selectedAnswers= array();
     $this->correct=array();
     $this->wrongQuestions=array();
     $this->lp_id;
     $this->rawToPass;
     $this->question=new Question();
     $this->percentTest=0;
   }

   function getQuestionLimit() {
     return  $this->questionLimit;
   }

   function setQuestionLimit($numOfQu){
     $this->questionLimit= $numOfQu;
   }

   function setTopicID($id) {
     $this->topicID=$id;
   }

   function getTopicID(){
     return $this->topicID;
   }


   function getAnswerList () {
     return $this->answerList;
   }

   function setRawToPass($percentage){
     $this->rawToPass=$percentage;
   }

   function generateQuestions(){ // Fragen werden random aus DB gelesen
     $sqlGetQu=" SELECT q_id,qt_id,t_id,question,description FROM questions WHERE t_id =".intval($this->topicID)." AND active=".intval(1)." ORDER BY RAND()LIMIT ".intval($this->questionLimit)."";
     $queryGetQu = mysql_query($sqlGetQu);
     $number=mysql_num_rows($queryGetQu);
     if($number== $this->questionLimit){
       $i=1; // z<>hler
       while($questions =mysql_fetch_array($queryGetQu ,MYSQL_BOTH  ))
       {

         $this->questionList[$i]['q_id']=$questions['q_id']; // in arra speichern
         $this->questionList[$i]['qt_id']=$questions['qt_id'];
         $this->questionList[$i]['t_id']=$questions['t_id'];
         $this->questionList[$i]['question']=stripslashes($questions['question']);
         $this->questionList[$i]['description']=$questions['description'];
         $sqlGetNumber="SELECT count(a_id)as number FROM answers WHERE q_id=".intval($questions['q_id'])." GROUP BY q_id";
         $queryGetNumber = mysql_query($sqlGetNumber);
         while($number =mysql_fetch_array( $queryGetNumber ,MYSQL_BOTH  ))
         {
           $this->questionList[$i]['numberOfAnswers']=$number['number'];
         }
         if($this->questionList[$i]['description']==1) {
           // beschreibung in Session speichern falls vorhanden
           $sql_desc="SELECT description FROM question_description WHERE q_id=".intval($questions['q_id'])."";
           $query_desc=mysql_query($sql_desc);
           $desc = mysql_fetch_assoc($query_desc);
           $this->questionList[$i]['description_text']=stripslashes($desc['description']);
         }
         $i++;
       }
       $_SESSION['values']['questionList']=$this->questionList;
     } else {
       echo "<h5>".Class_Quiz_01." </h5>";
       $value ="notEnoughQuestions";
       return $value;
     }
   }



   function getQuestionList()  {
     return $this->questionList;
   }


   function setQuestions() {
     $this->questionList=$_SESSION['values']['questionList'];
   }


   function getDBAnswers() { // Antworten zu den Frage aus DB holen
     for($i=1;$i<=$this->questionLimit;$i++){
       $value= $this->questionList[$i]['q_id'];
       $sqlGetAns="SELECT a_id,answer,correct  FROM answers WHERE q_id=".intval($value)."  ORDER BY RAND()";
       $queryGetAns = mysql_query($sqlGetAns);
       $j=1; // Z<>hler
       while($answers =mysql_fetch_array($queryGetAns ,MYSQL_BOTH  )) {
         $this->answerList[$value][$j]['q_id']= $value;
         $this->answerList[$value][$j]['a_id']=$answers['a_id']; // in arra speichern
         $this->answerList[$value][$j]['answer']=stripslashes($answers['answer']);
         $this->answerList[$value][$j]['correct']=$answers['correct'];
         $j++;
       }
     }
     $_SESSION ['values'] ['answerList']= $this->answerList;
   }

   function setAnswers(){
     $this->answerList=$_SESSION ['values']['answerList'];
   }

   function setSelectedAnswers (){
     $this->selectedAnswers=$_SESSION ['values']['selectedAnswers'];
   }

   function showQuiz() {
     echo "<form action='index.php?site=start_test&amp;action=evaluate' method='post'>";
     echo "<fieldset>";
     echo " <legend>".Class_Quiz_02."</legend>";
     echo "<table class='table_show_quiz'>";
     for($i=1;$i<=$this->questionLimit;$i++) {
       $value= $this->questionList[$i]['q_id']; // Value den Wert der q_id geben
       $question=str_replace("\n", "<br>", $this->questionList[$i]['question']);
       echo "<tr>";
       echo"<td class='nr' valign='top' >".Global_08." $i: </td>";

       if($this->questionList[$i]['qt_id']!=4) {
         echo"<td class='question' colspan='3'>$question </td> ";
         echo"</tr>";
       } // wenn der Typ nicht 4 ist anzeigen

       if($this->questionList[$i]['qt_id']==1) $this->SingleSelection($i,$value);
       if($this->questionList[$i]['qt_id']==2) $this->MultipleChoice($i,$value);
       if($this->questionList[$i]['qt_id']==3) $this->SingleSelection($i,$value); // Kann die selbe Maske verwendet werden
       if($this->questionList[$i]['qt_id']==4) $this->FillInTheBlanks($i,$value,$question);
     }
     echo "<tr>";
     echo "<td class='evaluate' colspan='4'>";
     echo"<input type='hidden' name='t_id' value='$this->topicID'/>";
     //echo"<input type='hidden' name='questionList' value='$questionList'/>";
     //echo"<input type='hidden' name='answerList' value='$answerList'/>";
     echo" <input name='submit' class='Button_right' type='submit' value='".Button_16."' /> ";
     echo "</td>";
     echo "</tr>";
     echo "</table>";
     echo "</fieldset>";
     echo"</form>";
   }

   function SingleSelection($i,$value){
     for ($j=1;$j<=$this->questionList[$i]['numberOfAnswers'];$j++){ // Solange Schleife durchlaufen wie die maximale Anzahl der Antworten ist
       $answer=$this->answerList[$value][$j]['answer'];
       $answerNumber=$this->answerList[$value][$j]['a_id'];
       if($answer!=null) {                        // Wenn es eine Antwort gibt soll diese angezeigt werden
         echo "<tr>";
         echo "<td class='nr' valign='top' ></td>";
         echo"<td class='choice' valign='top'><input type='radio' value='$answerNumber' name='selectedAnswers[$value]' /></td>";
         if ($answer=='true') echo" <td class='answer' valign='top'>".Class_Answer_09."</td>";
         else if ($answer=='false') echo" <td class='answer' valign='top'>".Class_Answer_10."</td>";
         else   echo" <td class='answer' valign='top'>$answer</td>";
         echo "<td class='symbol'></td>";
         echo "</tr>";
       }
     }
     echo "<tr class='padding'><td colspan='4' /></tr>";
   }

   function MultipleChoice($i,$value){
     for ($j=1;$j<=$this->questionList[$i]['numberOfAnswers'];$j++){ // Solange Schleife durchlaufen wie die maximale Anzahl der Antworten ist
       $answer=$this->answerList[$value][$j]['answer'];
       $answerNumber=$this->answerList[$value][$j]['a_id'];
       if($answer!=null){                         // Wenn es eine Antwort gibt soll diese angezeigt werden
         echo "<tr>";
         echo "<td class='nr' valign='top' ></td>";
         echo "<td class='choice' valign='top'><input type='checkbox' class='quiz_options' value='$answerNumber' name='selectedAnswers[$value][]' /></td>";
         echo " <td class='answer' valign='top'> $answer </td>";
         echo "<td class='symbol'></td>";
         echo "</tr>";
       }
     }
     echo "<tr class='padding'><td colspan='4' /></tr>";
   }

   function randomizeArray($answerList,$value) {
     $max=count($answerList[$value]); // setze Maximum
     $index=range(1,$max);  // Kreiire Array
     shuffle($index); // w<>rfle array
     $copy= $answerList; // kopie erstellen
     for($i=0;$i<$max;$i++){
       $k=$index[$i];
       $answerList[$value][$i+1]=$copy[$value][$k]; // zuweisen
     }
     $_SESSION ['values'] ['answerList']= $answerList;
     return $answerList;
   }

   function FillInTheBlanks($i,$value,$question) {
     echo '<td class="answer" valign="top" colspan="2">';
     $correctAns=$this->question->getCorrectAnswerFillInTheBlanks($question); // korrekte Antworen ermitteln
     $numberOfAnswers=$this->questionList[$i]['numberOfAnswers'];
     for ($l=0;$l<count($correctAns);$l++){
       $addCorrect = array( 'q_id'  => $value, 'a_id' => $correctAns[$l+1]['answer'],'answer' =>$correctAns[$l+1]['answer'],'correct'=>1,'blank'=>$correctAns[$l+1]['blank']);
       $numberOfAnswers=$numberOfAnswers+1; // Anzahl der Antworten erh<72>hen
       $this->answerList[$value][$numberOfAnswers]= $addCorrect ; // an richtiger Stelle einf<6E>gen
     }
     $this->answerList=$this->randomizeArray($this->answerList,$value);

     $addSlashes= preg_quote($question, '[^]'); // Slash hinzuf<75>gen wenn KLammer gefunden wird
     $array=explode('\\',$addSlashes); // String teilen
     for($k=0;$k<count($array);$k++){
       if((strstr($array[$k],'['))){
         echo"<select  name='selectedAnswers[$value][$k]' > ";
         for ($j=1;$j<=$numberOfAnswers;$j++){ // Solange Schleife durchlaufen wie die maximale Anzahl der Antworten ist
           $answer=$this->answerList[$value][$j]['answer'];
           $answerNumber=$this->answerList[$value][$j]['a_id'];
           //echo $this->answerList[$value][$j]['a_id'];
           echo"<option value='$answerNumber'>$answer</option>";
         }
         echo"</select>";
       }
       else if((strstr($array[$k],']'))){
         $array[$k]=str_replace("]",'', $array[$k]); // Klammer entfernen
          echo $array[$k];
       }
       else echo $array[$k];
     }
     echo "</td>";
     echo "<td class='symbol'></td>";
     echo "</tr>";
     echo "<tr class='padding'><td colspan='4' /></tr>";
   }


   function evaluateQuiz() {
     echo"<div>";
     echo "<fieldset>";

     echo "<legend>".Class_Quiz_03."</legend>\n";
     echo "<table class='table_show_quiz'>";
     for($i=1;$i<=count($this->questionList);$i++){
       $value= $this->questionList[$i]['q_id']; // Value den Wert der q_id geben
	     $question=str_replace("\n", "<br>", $this->questionList[$i]['question']);
       echo "\n<tr>";
       echo"<td class='nr' valign='top'  >".Global_08." $i : </td>";
       echo"<td class='question' colspan='3' >";
       if($this->questionList[$i]['qt_id']!=4){
         echo" $question </td> ";
         echo "</tr>";
       }
       $this->topicID=$this->questionList[$i]['t_id'];
       switch($this->questionList[$i]['qt_id']){
          case 1: {
            $this->evaluateSingleSelection($i,$value);

            break;
          }
          case 2: {
            $this->evaluateMultipleChoice($i,$value);
            break;
          }
          case 3: { 
            $this->evaluateSingleSelection($i,$value); // Kann die selbe Maske verwendet werden
            break;
          }
          case 4:{  
            //$this->getDBAnswers();
            $this->evaluateFillInTheBlanks($i,$value,$question);
            break;
          }
        }
      }

      echo "</table>";
      echo "</fieldset>";
      echo "</div>";

      $this->updateStatistic();
      $this->getTestResult();
      $this->createLearnProgress();

   }

   function evaluateSingleSelection($i,$value){
     for ($j=1;$j<=$this->questionList[$i]['numberOfAnswers'];$j++) { // Solange Schleife durchlaufen wie die maximale Anzahl der Antworten ist
       $answer=$this->answerList[$value][$j]['answer'];
       $answerNumber=$this->answerList[$value][$j]['a_id'];
       if($answer!=null) {                        // Wenn es eine Antwort gibt soll diese angezeigt werden
         echo "\n<tr>";
         echo "<td class='nr' valign='top' ></td>";
         echo "<td class='choice' valign='top'>";
         // Auswahl des Benutzers
         if(isset($this->selectedAnswers[$value]) && $this->selectedAnswers[$value]==$this->answerList[$value][$j]['a_id']) {
           echo"<input type='radio' value='$answerNumber' name='userChoice[$value]' class='quiz_options' checked='checked' disabled='disabled' />";
         } else {
           echo"<input type='radio' value='$answerNumber' name='userChoice[$value]'class='quiz_options' disabled='disabled' />";
         }
         echo "</td>";
         //richtige Antworten
         echo "<td class='choice' valign='top'>";
         if($this->answerList[$value][$j]['correct']==1) {
           echo"<input type='radio'class='quiz_options_correct' value='$answerNumber' disabled='disabled' name='correct[$value]' checked='checked' />";
           $show_class="answer correct";
         } else {
           echo"<input type='radio' class='quiz_options_correct'  disabled='disabled' value='$answerNumber' name='correct[$value]' />";
           $show_class="answer false";
         }
         echo "</td>";
         if ($answer=='true') echo" <td class='$show_class' valign='top'>".Class_Answer_09."</td>";
         else if ($answer=='false') echo" <td class='$show_class' valign='top'>".Class_Answer_10."</td>";
         else echo"<td class='$show_class' valign='top'>$answer</td>";

         echo "<td class ='evaluate'></td>";
         echo"</tr>";
       }

       if (isset($this->selectedAnswers[$value]) && isset($this->answerList[$value][$j]['correct']) &&
           $this->selectedAnswers[$value]==$this->answerList[$value][$j]['a_id'] && $this->answerList[$value][$j]['correct']==1) {
         $correct[]=1;
       }
     }
     $this->showDescription($i);

     if(!isset($correct)) $correct[]=0;
     $this->checkAnswers($correct,$value);
   }

   function evaluateMultipleChoice($i,$value) {
     for ($j=1;$j<=$this->questionList[$i]['numberOfAnswers'];$j++){ // Solange Schleife durchlaufen wie die maximale Anzahl der Antworten ist
       for($k=0;$k<$this->questionList[$i]['numberOfAnswers'];$k++){ // markieren welche Antworten der Benutzer ausgew<65>hlt hat
         if(isset($this->selectedAnswers [$value][$k]) && $this->selectedAnswers [$value][$k]!=null){ // wenn die Antwort nicht null ist
           if($this->selectedAnswers [$value][$k]==$this->answerList[$value][$j]['a_id'])$checked [$j]=1;
           else if(!isset($checked[$j]) || !$checked [$j]) $checked [$j]=0;
         }
       }
     }
     for ($j=1;$j<=$this->questionList[$i]['numberOfAnswers'];$j++){ // antworten die der Benutzer ausew<65>hlt hat ausgeben
       echo "\n<tr>";
       echo "<td class='nr' valign='top' ></td>";
       echo "<td class='choice' valign='top'>";
       $answer=$this->answerList[$value][$j]['answer'];
       $answerNumber=$this->answerList[$value][$j]['a_id'];
       if (!isset($checked[$j])) $checked[$j] = 0;
       if($checked[$j]==1) echo"<input type='checkbox' class='quiz_options' disabled='disabled' value='$answerNumber' checked='checked' name='userChoice[$value]' />";
       else if ($checked[$j]==0) echo"<input type='checkbox' class='quiz_options' disabled='disabled' value='$answerNumber'  name='userChoice[$value]' />";
       echo "</td>";
       //richtige Antworten ausgeben
       echo "<td class='choice' valign='top'>";
       if($this->answerList[$value][$j]['correct']==1) {
         echo"<input type='checkbox'class='quiz_options_correct' value='$answerNumber' disabled='disabled' name='correct[$value]' checked='checked' />";
         $show_class = "answer correct";
       } else {
         echo"<input  type='checkbox'  class='quiz_options_correct'  disabled='disabled' value='$answerNumber' name='correct[$value]' />";
         $show_class = "answer false";
       }
       echo "</td>";
       echo"<td class='$show_class' valign='top'> $answer </td>";
       echo "<td class ='evaluate'></td>";
       echo"</tr>";
       if(($this->answerList[$value][$j]['correct']==1) && ($checked [$j]==1)){ //Pr<50>fung auf Richtigkeit
         $correct[$j]=1;
         unset($this->answerList[$value][$j]);
       } else if(($this->answerList[$value][$j]['correct']==1)&& ($checked [$j]==0))$correct[$j]=0;
       else if(($this->answerList[$value][$j]['correct']==0) && ($checked [$j]==1))$correct[$j]=0;
     }
     $this->showDescription($i);
     $this->checkAnswers($correct,$value);

   }

   function evaluateFillInTheBlanks($i,$value,$question){
     $addSlashes= preg_quote($question, '[^]'); // Slash hinzuf<75>gen wenn KLammer gefunden wird
     $array=explode('\\',$addSlashes); // String teilen
     // Was Benutzer markiert hat
     for($k=0;$k<count($array);$k++){
       if((strstr($array[$k],'['))){
         $array[$k]=str_replace("[",'', $array[$k]); // Klammer entfernen
         for ($j=1;$j<=count($this->answerList[$value]);$j++){ // antworten die der Benutzer ausew<65>hlt hat ausgeben
           $answer=$this->answerList[$value][$j]['answer']; // Amtwort wird zugewiesen
           if($this->selectedAnswers[$value][$k]==$this->answerList[$value][$j]['a_id']){
             echo " <input name='[$i]' readonly='readonly'  size='20' value='$answer' />";
             if(isset($this->answerList[$value][$j]['blank']) && $this->answerList[$value][$j]['blank']==$k) $correct[]=1;
             else $correct[]=0;
             break;
           }
         }
       } else if((strstr($array[$k],']'))){
         $array[$k]=str_replace("]",'', $array[$k]); // Klammer entfernen
         echo $array[$k];
       } else echo $array[$k];
     }
     echo "</td>";
     echo "</tr>";

     echo "\n<tr>";
     echo "<td class='nr' valign='top' ></td>";
     echo "<td class='question' colspan='3'>";

     // Was richtig ist
     $addSlashes= preg_quote($question, '[^]'); // Slash hinzuf<75>gen wenn KLammer gefunden wird
     $array=explode('\\',$addSlashes); // String teilen
     //echo" <div id=\"quiz_fill_in_the_blank\" >";

     for($k=0;$k<count($array);$k++){
       if((strstr($array[$k],'['))){
         $array[$k]=str_replace("[",'', $array[$k]); // Klammer entfernen
          echo " <input name='[$i]' readonly='readonly'  size='20' value='$array[$k]' />";
       } else if((strstr($array[$k],']'))) {
         $array[$k]=str_replace("]",'', $array[$k]); // Klammer entfernen
          echo $array[$k];
       } else echo $array[$k];
     }
     echo "</td>";
     echo "</tr>";

     $this->showDescription($i);
     $this->checkAnswers($correct,$value);
   }

   function checkAnswers($correct,$value) {
     $check = in_array(0, $correct);  // Pr<50>fen ob im Array der Wert 0 ist, denn dann wurde mindestens eine Antwort falsch beantwortet
     echo "\n<tr>";
     if(!$check)echo"<td class='symbol' colspan='7'><img src='images/correct.png' alt='' /></td>";
     else {
       $this->wrongQuestions[]=$value;
       echo"<td class='symbol'  colspan='7'><img src='images/wrong.png' alt='' /></td>";
     }
     echo "</tr>";
   }

   function updateStatistic() {
     for($i=1;$i<=$this->questionLimit;$i++) {
       $sql="SELECT count  FROM statistics WHERE q_id=".intval($this->questionList[$i]['q_id'])."";
       $query = mysql_query($sql);
       while($count=mysql_fetch_array($query ,MYSQL_BOTH  )){
         $count=$count['count'];
         $count=$count+1;
         $sql_update="UPDATE statistics SET count=".intval($count)." WHERE q_id=".intval($this->questionList[$i]['q_id'])."";
         $query_update = mysql_query($sql_update);
       }
     }
   }

   function createLearnProgress() { // Lernprogress erstellen
     $timestamp = time();
     $date= date("Y-m-d H:i:s" ,$timestamp); // aktuelles Datum und Uhrzeit berechnen
     $correctAnswers=$this->questionLimit-count($this->wrongQuestions);
     $wrongAnswers=count($this->wrongQuestions);
     $passed=$this->testPassed;
     $sql="INSERT INTO learnprogress (user_id,root,date,t_id,number,correct,wrong,percentage,passed)
           VALUES ('".mysql_real_escape_string($_SESSION['profile']['id'])."',
           '".mysql_real_escape_string($_SESSION['profile']['root'])."',
           '$date',
           ".intval($this->topicID).",
           ".intval($this->questionLimit).",
           ".intval($correctAnswers).",
           ".intval($wrongAnswers).",
           ".mysql_real_escape_string($this->percentTest).",
           ".intval($passed).")";
     $query = mysql_query($sql);
     $this->lp_id = mysql_insert_id();
     $this->insertAnswersIncorrect();
   }

   function insertAnswersIncorrect(){
     foreach($this->wrongQuestions as $value){
       $sql="INSERT INTO answers_incorrect (lp_id,q_id) VALUES ( ".intval($this->lp_id).",".intval($value).")";
       $query = mysql_query($sql);
     }
   }

   function getTestResult(){
     $wrong=count($this->wrongQuestions);
     $correct=$this->questionLimit-$wrong;
     if($wrong==0)$percentTest=100;
     else if(($wrong>=$this->questionLimit) || ($this->questionLimit < 1))$percentTest=0;
     else $percentTest=($correct/$this->questionLimit)*100;

     $percentTest=round($percentTest, 2);
     $this->percentTest=$percentTest;
     $this->testPassed=0;
     if($this->rawToPass > 0 && $this->rawToPass <= $percentTest)$value="".Class_Quiz_08."";
     else $value="".Class_Quiz_09."";

     echo'<p class="centered"> '.Global_05." : <br />";
     global $questionlimit;
     $questionlimit =$this->questionLimit;
     echo" ".Class_Quiz_04." $correct / $this->questionLimit <br />";
     echo" ".Class_Quiz_05." <b>$this->rawToPass %</b> ";
     echo "<br /> ".Class_Quiz_06." <b>".$this->percentTest." % </b> ".Class_Quiz_07." <b>$value</b> <br /></p>";
     //createLearnProgress();

     if($this->rawToPass > 0 && $this->rawToPass <= $percentTest) {
       $this->testPassed=1;
       // Test has been passed, maybe a paper/PDF-certificate can be requested
       if ($_SERVER['SSL_CLIENT_S_DN_CN']=="CAcert WoT User") {
         // Sorry, we cannot issue certificates for anonymous users
         echo '<br /><p class="centered">'.Class_Quiz_10_AnonymousCert."</p>";
       } else {
         echo "<form class='info' action='index.php?site=start_test&amp;action=requestCert' method='post'>";
         echo "<input type='hidden' name='t_id' value='$this->topicID' />";
         echo "<input name='submit' class='Button_middle' type='submit' value='".Class_Quiz_11_RequestCert."' />";
         echo "</form>";
       }
     }
   }

   function showDescription($i){
     if(isset($_SESSION['values']['questionList'][$i]['description_text'])){
       // Ausgabe der Beschreibung
       echo "\n<tr>";
       echo "<td class='nr'></td>";
       echo"<td class='answer description' colspan='4'>".$_SESSION['values']['questionList'][$i]['description_text']."</td>";
       echo "<td class ='evaluate'></td>";
       echo "</tr>";
     }
   }
}

?>