"working", self::FINISH => "finish", ]; if ('' === $index) { return $arr; } if (isset($arr[$index])) { return $arr[$index]; } else { return ''; } } /** * @param string $index * @return array|string */ static function getLabels($index = '') { $arr = [ self::WORKING => "维修中", self::FINISH => "维修完成", ]; if ('' === $index) { return $arr; } if (isset($arr[$index])) { return $arr[$index]; } else { return ''; } } }