public static function isChildGroup_member($MemberId, $ChildMemberId)
 {
     $ischild = false;
     $obj_retResult = DAL_manageGroup_member::getGroup_memberListByMemberId($ChildMemberId);
     //get child node
     if ($obj_retResult->type == 1) {
         $arr_Group_memberList = $obj_retResult->data;
         $obj_Group_member = $arr_Group_memberList[0];
         $arrParentIds = explode(",", $obj_Group_member->Url);
         foreach ($arrParentIds as $Group_memberParentId) {
             if ($Group_memberParentId == $MemberId) {
                 $ischild = true;
             }
         }
     }
     return $ischild;
 }