Archive Tar Laravel Package

Getting Started

The pear/archive_tar package (now updated to 1.6.0) remains a PEAR-based solution for .tar archive manipulation, though it is increasingly niche due to its reliance on legacy PHP versions and PEAR. This release drops PHP 5.4/5.5 support, requiring PHP 5.6+ (or ideally PHP 7.x+ for stability).

Install via PEAR:

pear install pear/archive_tar

Or include manually in Composer projects (e.g., via pear-core-minimal).

First use case: Extract a .tar file (unchanged):

require_once 'Archive/Tar.php';

$tar = new Archive_Tar('archive.tar');
if ($tar->extract('./output_dir')) {
    echo "Extracted successfully";
}

Check the examples/ directory in the source for additional patterns.

Implementation Patterns

Core Workflows

• Reading archives: Use listContent() to inspect contents without extraction.

  $files = $tar->listContent();
  foreach ($files as $file) {
      echo $file['filename'] . " ({$file['size']} bytes)\n";
  }
  

• Adding files/directories: Use add() with an array of paths.

  $tar->add(['file1.txt', 'dir/']);
  

• String-based operations: Generate tar content in memory for streaming.

  $data = $tar->createArchiveString(['file1.txt']);
  header('Content-Type: application/x-tar');
  echo $data;
  

New/Improved Features (1.6.0)

• Large file support: PR #51 introduces optimizations for handling large archives (though memory constraints still apply; see Gotchas).
• Fixed _writeBlock return value: PR #53 resolves a potential edge case in custom stream handling.

Advanced Patterns

• Prefix support: Prepend a directory to all files (e.g., for plugin bundles).

  $tar->setPrefix('myplugin/');
  

• Error handling: Always check $tar->errorInfo() after operations.

Gotchas and Tips

Breaking Changes (1.6.0)

• PHP 5.4/5.5 dropped: Projects using these versions must upgrade or seek alternatives (e.g., chadicus/tar or fony/tar).
• Removed gzip shims: PR #58 eliminates internal gzopen/gztell wrappers. For .tar.gz files:
  • Use exec('tar -xzf ...') for CLI-based extraction.
  • Combine with Archive_Tar + gzdecode()/gzencode() for in-memory handling (less reliable).
  • Consider pear/archive_zip or modern alternatives for compressed archives.

Legacy Pitfalls

• No gzip/bzip2 support: Core functionality remains limited to plain .tar. External tools or modern packages are required for compressed formats.
• Multibyte paths: Unicode filenames may corrupt or truncate. Test thoroughly in target environments.
• Permissions: Extracted files retain original permissions but may fail silently due to umask or filesystem restrictions.
• Memory limits: Large archives still risk listContent()/extract() memory exhaustion. Use setTemporaryDir() to offload processing.

Performance and Extensibility

• Large file optimizations: PR #51 improves handling but does not eliminate memory constraints. For very large archives, consider:
  • Streaming extraction with custom _readBlock() overrides.
  • Offloading to disk via setTemporaryDir().
• Extensibility: Override _writeBlock() or _readBlock() for custom streams (e.g., S3), but documentation is sparse. Prefer modern packages for complex use cases.

Maintenance and Alternatives

• No active maintenance: The 2025 release date in the original assessment is likely a placeholder. The package’s low adoption and PEAR dependency make it non-recommended for new projects.
• Recommended alternatives:
  • Modern PHP: Use chadicus/tar (Composer) or fony/tar (Symfony ecosystem).
  • Compressed archives: pear/archive_zip (for .zip) or CLI tools (exec('tar')).
  • Legacy PEAR: If locked into PEAR, test thoroughly and monitor for future breakages.

Debugging Tips

• Silent failures: Always check $tar->errorInfo() after operations.
• Path normalization: Verify filenames with listContent() before extraction.
• Symlinks/hardlinks: These may not round-trip correctly; test in staging.

Final Note: This package is only viable for legacy PEAR-based systems. For new Laravel projects, prioritize chadicus/tar or native PHP streams.