为什么zip文件在下载后无法打开但是通过手动传输很好？

I searched and tried a few previous questions/example codes, but couldn't get this to work.

I'm trying to deliver the results to end-users via PHP code. Here is my code.

       $varZipFile = $varBaseNameParts[0] . '.' . $varDate . '.zip';
       $varZipDir = $varBaseNameParts[0] . '_' . $varDate;

       $zip = new ZipArchive();
       $zip->open($varZipFile, ZipArchive::CREATE | ZipArchive::OVERWRITE);
       $zip->addFile('008.csv');
       $zip->addFile('002.csv');
       $zip->close(); // mark line xxx

       header("Content-Type: application/zip");
       header("Content-disposition: attachment;filename=$varZipFile");
       header('Content-Length: ' . filesize($varZipFile)); // with or without this line, got the same error 
       header("Content-Type: application/force-download"); // with or without this line, got the same error 
       readfile($varZipFile);

I got the .zip file in my browser. However WinZip cannot open it, neither can 7-Zip. WinZip complains that "Error: Central directory not found".

Interestingly, when I manually transfer the file via WinSCP from my server to my Windows machine, I can open the file with either WinZip or 7-Zip. This indicates it works all fine to 'mark line xxx', and problems occurs in the header lines.

TIA!

Your ouput buffer may not be cleared before you try to serve the download. Try to clean the output buffer before serving the download with the ob_clean() function like this:

$zip->close(); // mark line xxx
ob_clean();

Your code is working well on my side, debug this $varBaseNameParts[0] to see if the value is correct or try the below code.

// $name = name of the archive
// $archive_directory = directory to save the archive
// $file_array = list of files
function create_archive($name, $archive_directory, $file_array) {
    $target_file = $archive_directory . '/' . $name . date('m-d-y').date('h-i-sa') . '.zip';
    $zip = new ZipArchive();
    if (count($file_array)) {
        if ($zip->open($target_file, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE)) {
            foreach ($file_array as $file) {
                $zip->addFile($file);
            }
            $zip->close();
            chmod($target_file, 0777);
            return $target_file;
        }
    }
    return null;
}

function create_download($archive) {
    $file_name = basename($archive);
    header("Content-Type: application/zip");
    header("Content-Disposition: attachment; filename=$file_name");
    header("Content-Length: " . filesize($archive));

    readfile($archive);
}

// create the archive file
$archive = create_archive('test', 'archive', ['008.csv', '002.csv']);
if ($archive) {
    create_download($archive);
}