public function getTeachersData($classid)
 {
     $colid = Session::get('user')->collegeid;
     // $colid = "bt123";
     $teachers = Teacher::whereRaw('collegeid = ? and classid = ?', array($colid, $classid))->get();
     $data['data'] = [];
     $i = 0;
     for ($i = 0; $i < sizeof($teachers); $i++) {
         $data['data'][$i]['pic'] = "<img class= \"img-circle width-1 height-1\" src=\"." . $teachers[$i]->profilepic . ".\">";
         $data['data'][$i]['name'] = $teachers[$i]->name;
         $data['data'][$i]['email'] = $teachers[$i]->email;
         $data['data'][$i]['phone'] = $teachers[$i]->phone;
         $flag = Auth::user()->flag;
         if ($flag == 3) {
             $data['data'][$i]['action'] = "<button type=\"button\" class=\"btn btn-xs btn-icon-toggle\" style=\"float: right;  margin-bottom: -0.6em; margin-top: -0.5em;\" data-toggle=\"tooltip\" data-placement=\"top\" data-original-title=\"Copy row\"><i class=\"fa fa-copy\"></i></button>";
         } else {
             $data['data'][$i]['action'] = "<button type=\"button\" class=\"btn btn-xs btn-icon-toggle\" style=\"float: right; margin-bottom: -0.6em; margin-top: -0.5em; \" data-toggle=\"tooltip\" data-placement=\"top\" data-original-title=\"Delete row\"><i class=\"fa fa-trash-o\"></i></button>\n\n             <button type=\"button\" class=\"btn btn-xs btn-icon-toggle\" style=\"float: right;  margin-bottom: -0.6em; margin-top: -0.5em;\" data-toggle=\"tooltip\" data-placement=\"top\" data-original-title=\"Copy row\"><i class=\"fa fa-copy\"></i></button>\n\n             <button type=\"button\" class=\"btn btn-xs btn-icon-toggle\" style=\"float: right;  margin-bottom: -0.6em; margin-top: -0.5em;\" data-toggle=\"tooltip\" data-placement=\"top\" data-original-title=\"Edit row\"><i class=\"fa fa-pencil\"></i></button>";
         }
     }
     return $data;
     // return json_encode($data);
 }