/**
  * fetches students information for an acdemic class
  * Enter description here ...
  * @param int $class_id
  */
 private function findStuClassInfo($member_id, $class_id)
 {
     $member_id_exists = $this->memberIdCheck($member_id);
     if ($member_id_exists) {
         $student = new Core_Model_Member_Student();
         $student->setMember_id($member_id);
         $info = $student->fetchClassInfo($class_id);
         if ($info instanceof Core_Model_StudentClass) {
             $stu_class_info = array();
             $stu_class_info['roll_no'] = $info->getRoll_no();
             $stu_class_info['group_id'] = $info->getGroup_id();
             $stu_class_info['start_date'] = $info->getStart_date();
             $stu_class_info['completion_date'] = $info->getCompletion_date();
             foreach ($stu_class_info as $key => $value) {
                 if ($value == null) {
                     unset($stu_class_info[$key]);
                 }
             }
         } else {
             $stu_class_info = false;
             /*$message = 'No member_class info for class_id ' . $class_id;
               $code = Zend_Log::ERR;
               throw new Exception($message, $code);*/
         }
         return $stu_class_info;
     }
 }