Create a zip file and download it

Question

I am trying to download a 2 files by creating the zip file on local-server the file is downloaded in zip format but when i try to extract it it gives error   End-of-central-directory signature not found   Either this file is not   a zip file  or it constitutes one disk of a multi-part archive   In the   latter case the central directory and zip file comment will be found on   the last disk s  of this archive   the following code i am using for this     lt  php  file names   array  iMUST Operating Manual V1 3a pdf   iMUST Product Information Sheet pdf       Archive name  archive file name  name  iMUST Products zip      Download Files path  file path   SERVER  DOCUMENT ROOT     Harshal files      zipFilesAndDownload  file names  archive file name  file path    function zipFilesAndDownload  file names  archive file name  file path              echo  file path die       zip   new ZipArchive          create the file and throw the error if unsuccessful     if   zip- gt open  archive file name  ZIPARCHIVE  CREATE     TRUE            exit  cannot open  lt  archive file name gt  n                add each files of  file name array to archive     foreach  file names as  files                 zip- gt addFile  file path  files  files             echo  file path  files  files               zip- gt close          then send the headers to force download the zip file     header  Content-type  application zip         header  Content-Disposition  attachment  filename  archive file name         header  Pragma  no-cache         header  Expires  0         readfile   archive file name        exit          gt    i checked the values of all variables which are passing into the function all are fine so please look this Thanks in advance

User · Answer

but the file i am getting from server after download it gives the size of 226 bytes

This is the size of a ZIP header. Apparently there is no data in the downloaded ZIP file. So, can you verify that the files to be added into the ZIP file are, indeed, there (relative to the path of the download PHP script)?

Consider adding a check on addFile too:

foreach($file_names as $file)
{
    $inputFile = $file_path . $file;
    if (!file_exists($inputFile))
        trigger_error("The input file $inputFile does not exist", E_USER_ERROR);
    if (!is_readable($inputFile))
        trigger_error("The input file $inputFile exists, but has wrong permissions or ownership", E_USER_ERROR);
    if (!$zip->addFile($inputFile, $file))
        trigger_error("Could not add $inputFile to ZIP file", E_USER_ERROR);
}

The observed behaviour is consistent with some problem (path error, permission problems, ...) preventing the files from being added to the ZIP file. On receiving an "empty" ZIP file, the client issues an error referring to the ZIP central directory missing (the actual error being that there is no directory, and no files).

User · Answer

I have experienced exactly the same problem  In my case  the source of it was the permissions of the folder in which I wanted to create the zip file that were all set to read only  I changed it to read and write and it worked    If the file is not created on your local-server when you run the script  you most probably have the same problem as I did

User · Answer

zip   new ZipArchive   tmp file    assets myzip zip       if   zip- gt open  tmp file   ZipArchive  CREATE              zip- gt addFile  folder bootstrap js    bootstrap js             zip- gt addFile  folder bootstrap min js    bootstrap min js             zip- gt close            echo  Archive created            header  Content-disposition  attachment  filename files zip            header  Content-type  application zip            readfile  tmp file        else          echo  Failed

User · Answer

http headers for zip downloads header  Pragma  public    header  Expires  0    header  Cache-Control  must-revalidate  post-check 0  pre-check 0    header  Cache-Control  public    header  Content-Description  File Transfer    header  Content-type  application octet-stream    header  Content-Disposition  attachment  filename      filename        header  Content-Transfer-Encoding  binary    header  Content-Length    filesize  filepath  filename    ob end flush     readfile  filepath  filename     I found this soludtion here and it work for me

User · Answer

Add Content-length header describing size of zip file in bytes   header  Content-type  application zip     header  Content-Disposition  attachment  filename  archive file name    header  Content-length      filesize  archive file name    header  Pragma  no-cache     header  Expires  0     readfile   archive file name      Also make sure that there is absolutely no white space before  lt   and after   gt   I see a space here        lt  php  file names   array  iMUST Operating Manual V1 3a pdf   iMUST Product Information Sheet pdf

User · Answer

One of the error could be that the file is not read as  archive  format  check out ZipArchive not opening file - Error Code  19  Open the downloaded file in text editor  if you have any html tags or debug statements at the starting  clear the buffer before reading the file   ob clean    flush    readfile   archive file name

User · Answer

I just ran into this problem  For me the issue was with   readfile   archive file name      It was resulting in a out of memory error   Allowed memory size of 134217728 bytes exhausted  tried to allocate 292982784 bytes    I was able to correct the problem by replacing readfile   with the following        handle   fopen  zipPath   rb        while   feof  handle            echo fread  handle  8192             fclose  handle     Not sure if this is your same issue or not seeing that your file is only 1 2 MB  Maybe this will help someone else with a similar problem

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