public function getQuestionsOfQuiz($quizId)
 {
     $questions = array();
     $quizId = (int) $quizId;
     $managerProp = new PropositionManager();
     $result = $this->_access->getResults($this->_access->prepare("SELECT * FROM " . StudyPressDB::getTableNameQuestions() . " WHERE " . StudyPressDB::COL_ID_QUIZ_QUESTION . " = '%d' ORDER BY " . StudyPressDB::COL_ORDER_QUESTION . " ASC", $quizId));
     foreach ($result as $row) {
         $question = self::returnedQuestion($row);
         if ($question) {
             $question->setPropositions($managerProp->getPropositionsOfQuestion($question->getId()));
             array_push($questions, $question);
         }
     }
     return $questions;
 }