code: public static function identify($pFilename)
      {
          $reader = self::createReaderForFile($pFilename);
          $className = get_class($reader);
          $classType = explode('\\', $className);
          unset($reader);
  
          return array_pop($classType);
      }
docs: Identify file type using automatic Reader\IReader resolution.
  
  @param string $pFilename The name of the spreadsheet file to identify
  
  @throws Reader\Exception
  
  @return string