public static function isChildSociety_member($MemberId, $ChildMemberId)
 {
     $ischild = false;
     $obj_retResult = DAL_manageSociety_member::getSociety_memberListByMemberId($ChildMemberId);
     //get child node
     if ($obj_retResult->type == 1) {
         $arr_Society_memberList = $obj_retResult->data;
         $obj_Society_member = $arr_Society_memberList[0];
         $arrParentIds = explode(",", $obj_Society_member->Url);
         foreach ($arrParentIds as $Society_memberParentId) {
             if ($Society_memberParentId == $MemberId) {
                 $ischild = true;
             }
         }
     }
     return $ischild;
 }