code: private function extractFilename(\ZipArchive $zipArchive, $fileIndex)
      {
          $entry = $zipArchive->statIndex($fileIndex);
  
          // convert Windows directory separator to Unix style
          $filename  = str_replace('\\', '/', $entry['name']);
  
          if ($this->isValidPath($filename)) {
              return $filename;
          }
  
          throw new \Exception('Invalid filename path in zip archive');
      }
docs: Extract filename from .zip
  
  @param \ZipArchive $zipArchive Zip file
  @param integer     $fileIndex  File index
  
  @return string