archive created by PHP ZipArchive class opened with WinRar but not with WinZip -

i using ziparchive class zip files residing on server. able extract downloaded zip winrar not winzip. , if download created zip directly server via filezilla able extract winzip.

please have @ following script using:-

            $zip = new ziparchive();     //create file , throw error if unsuccessful     if ($zip->open($archive_file_name, ziparchive::create )!==true) {         exit("cannot open <$archive_file_name>\n");     }      //add each files of $file_name array archive     foreach($file_names $files)  {          $zip->addfile($file_path.$files,$files);         }      $zip->close();      //get size of archive     $zipped_size = filesize($archive_file_name);      //set required headers     header("content-description: file transfer");     //header("content-type: application/zip");     header("content-type: application/octet-stream");     header("cache-control: public", false);     header("pragma: public");     header("expires: 0");     //header("content-type: application/x-zip-compressed");     //header("content-type: application/force-download");// browsers need     header("content-disposition: attachment; filename=cv-archive.zip");     header('expires: 0');     header('cache-control: must-revalidate, post-check=0, pre-check=0');     header("content-transfer-encoding: utf-8");     header('pragma: public');     //header("content-length:". "$zipped_size");      ob_clean(); //ob_clean , flush required make sure no line space generated before output corrupt zip archive     flush();     readfile("$archive_file_name");     unlink("$archive_file_name"); // delete temp file (some servers need option)     foreach($file_names $files)  {         unlink($file_path.$files);   }     exit;  

your download script adding additional output, possibly white space before <?php tag or maybe after ?> tag in included file. or maybe unlink($file_path.$files); displaying warning.