foreach ($arrRet as $key => $array) {
                foreach ($arrDispID as $val) {
                    if ($array['category_id'] == $val) {
                        $arrRet[$key]['display'] = 1;
                        break;
                    }
                }
            }
を
            foreach ($arrRet as $key => $array) {
                foreach ($arrDispID as $val) {
                    $arrRet[$key]['display'] = 1;
                }
            }