问题是当文件夹中有很多文件时，下面的脚本正在下载一个0字节的zip文件。
我也用if（file_exists="/folder/path/file.txt）子句测试过，脚本似乎可以找到文件。我做错了什么？

<?php
// Define the folder to be zipped
$folder_path = '/CA11.2.4/logs/';



// Define the name of the zipped file with a timestamp
$zip_file_name = 'logs_' . date('Ymd_His') . '.zip';

// Create a new ZipArchive instance
$zip = new ZipArchive();

// Open the zip file for writing
if ($zip->open($zip_file_name, ZipArchive::CREATE) !== TRUE) {
    die ('Could not create zip archive');
}

// Add the files from the folder to the zip file
$dir = opendir($folder_path);
while ($file = readdir($dir)) {
    if (is_file($folder_path . $file)) {
        $zip->addFile($folder_path . $file, $file);
    }
}

// Close the directory handle
closedir($dir);

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

// Set headers to force download the zip file
header('Content-Type: application/zip');
header('Content-Disposition: attachment; filename="' . $zip_file_name . '"');
header('Content-Length: ' . filesize($zip_file_name));

// Send the zip file to the client for download
readfile($zip_file_name);

// Delete the zip file from the server
//unlink($zip_file_name);

// Redirect back to the referring page
//header('Location: ' . $_SERVER['HTTP_REFERER']); 
?>

我最初怀疑可能是它没有检测到路径，所以我添加了这个片段，并注解掉其他代码来验证，它工作了。

<?php
$path = '/path/to/folder/file.txt';

if (file_exists($path)) {
    echo 'Path exists on server';
} else {
    echo 'Path does not exist on server';
}