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archive-tar — Lightweight implementation of TAR archive reader for PHP with support for gz, bz2, xz (experimental) and files larger then 2 GB
Similar bz2

Some additional repos to consider:
Zippy — PHP zip/tar/bz2 archives (de)compression library with commandline or extensions
Similar Compression
UnifiedArchive 0.1.1 — UnifiedArchive - unified interface to all popular archive formats (zip, 7z, rar, gz, bz2, xz, cab, tar, tar.gz, tar.bz2, tar.xz, tar.Z, iso) for listing, reading, extracting and creation + built-in console archive manager.
Similar 7z

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