code: private static function getCacheName($name)
      {
          if (empty(self::$cachePath)) {
              self::$cachePath = dirname(__DIR__) . DIRECTORY_SEPARATOR . 'Cache' . DIRECTORY_SEPARATOR;
          }
          self::$cachePath = rtrim(self::$cachePath, '/\\') . DIRECTORY_SEPARATOR;
          file_exists(self::$cachePath) || mkdir(self::$cachePath, 0755, true);
          return self::$cachePath . $name;
      }
docs: 应用缓存目录
  @param string $name
  @return string