public static function alreadyMember($GCID, $StudentID)
 {
     $check = GroupChatMember::where('GCID', $GCID)->where('StudentID', $StudentID)->where('delFlag', 0)->first();
     if (count($check)) {
         return true;
     } else {
         return false;
     }
 }
 public function groupDeleteMember($gcid)
 {
     $in = Input::all();
     $groupChat = GroupChat::where('ID', $gcid)->first();
     if ($groupChat->StudentID == Auth::user()->StudentID) {
         GroupChatMember::where('GCID', $gcid)->where('StudentID', $in['AccID'])->update(['delFlag' => 1]);
         return 'ok';
     }
 }