How can different zip file viewers affect the display of empty directories created using PHP?

Different zip file viewers may handle empty directories created using PHP differently, potentially not displaying them at all. To ensure that empty directories are displayed correctly across different zip file viewers, you can include a placeholder file within each empty directory before zipping the contents. This will ensure that the empty directories are preserved and displayed correctly when the zip file is viewed. 

$zip = new ZipArchive;
$zipFileName = 'example.zip';

if ($zip->open($zipFileName, ZipArchive::CREATE) === TRUE) {
    // Add files to the zip archive
    $zip->addFile('file1.txt');
    
    // Create empty directories with placeholder files
    $zip->addEmptyDir('empty_directory1');
    $zip->addFromString('empty_directory1/placeholder.txt', '');
    
    $zip->addEmptyDir('empty_directory2');
    $zip->addFromString('empty_directory2/placeholder.txt', '');
    
    $zip->close();
    echo 'Zip file created successfully';
} else {
    echo 'Failed to create zip file';
}

Keywords

Zip files viewers empty directories PHP display.

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