php ZipArchive implements multi-file packaging download example

public function downLoad($dataUrl,$saveName)
  {
    $datalist = [
      ROOT_PATH.'/public/introduce/',
      ROOT_PATH.'/public/upfile/'
    ];
//    print_r($datalist);die;
    $filename = ROOT_PATH.'\public\/'.$saveName.'.zip';
    if(file_exists($filename)){
      unlink($filename);
    }

    $zip = new \ZipArchive();
    if ($zip->open($filename,\ZipArchive::CREATE)!== true){
      exit('Cannot open the file, or the file creation failed');
    }

    foreach ($dataUrl as $index => $item) {
      if (DIRECTORY_SEPARATOR=='\\'){
        $item = str_replace('/',DIRECTORY_SEPARATOR,$item);
        $filename = str_replace('/',DIRECTORY_SEPARATOR,$filename);
      }
//      var_dump($item);
//      var_dump(file_exists($item));die;
      if (file_exists($item)){
        $zip->addFile($item,basename($item));
      }
    }

    $zip->close();
    if(!file_exists($filename)){
      exit("File cannot be found"); //Even if created, it may still fail    }
    header('Content-Type: application/zip');
    header('Content-disposition: attachment; filename='.basename($filename));
    header('Content-Length: ' . filesize($filename));
    @readfile($filename);
　@unlink ( $filename );
}

public function unzip_file($file, $dir){ 

    // Instantiate the object
    $zip = new ZipArchive() ; 

    //Open the zip document, if it fails to open, return the prompt message
    if ($zip->open($file) !== TRUE) { 

     die ("Could not open archive"); 

    } 

    //Decompress the compressed file to the specified directory
    $zip->extractTo($dir); 

    //Close the zip document
    $zip->close(); 

  }

public function loopFun($dir) 

  { 

    $handle = opendir($dir.".");

    //Define an array to store file names
    $array_file = array();

    while (false !== ($file = readdir($handle)))

    {

      if ($file != "." && $file != "..") {

        $array_file[] = $dir.'/'.$file; //Output file name
      }

    }

    closedir($handle);

    return $array_file;

    //print_r($array_file);

  }