从数据库中取出的数据，字段名为gb2312的 数据转码为utf8

                $pj = Pj::find()->where($map)->asArray()->one();
                if(!empty($pj)) {
                    foreach ($pj as $k=>$v) {
                        $f = iconv('GBK', 'UTF-8', $k);
                        $result['pj'][$f] = $v;
                    }
                }
                $mfjctl = Mfjctl::find()->where($map)->asArray()->one();
                if(!empty($mfjctl)) {
                    foreach ($mfjctl as $k=>$v) {
                        $f = iconv('GBK', 'UTF-8', $k);
                        $result['mfjctl'][$f] = $v;
                    }
                }