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';
     }
 }