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LZW: Compress and uncompress data with LZW algorithm

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Picture of Sam Shull
Name: Sam Shull <contact>
Classes: 9 packages by
Country: United States United States
Age: 38
All time rank: 36940 in United States United States
Week rank: 324 Up36 in United States United States Up
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This class can be used to compress and uncompress data with the LZW algorithm in pure PHP code.

It can take a string of data and compress it with the LZW algorithm. It can also do the opposite, i.e. extract the original data from compressed string using the same algorithm.

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Name: LZW
Base name: lzwc
Description: Compress and uncompress data with LZW algorithm
Version: -
PHP version: 4.0
License: BSD License
All time users: 1507 users
All time rank: 2396
Week users: 2 users
Week rank: 847 Up
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Group folder image Algorithms Numerical and statistical algorithms View top rated classes
Group folder image Compression Data compression and file archive manipulation View top rated classes

  Innovation Award  
PHP Programming Innovation award nominee
August 2007
Number 7

Prize: One license of PHPEdit Professional
LZW (Lempel-Ziv-Welch) is a compression algorithm made popular for its use in the formats GIF, TIFF and PDF.

This class can be used to compress and decompress data that uses LZW algorithm in pure PHP.

It makes possible to encode and decode image and documents that employ this algorithm using only pure PHP code, thus without any special PHP extensions.

Manuel Lemos

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  Related pages  
LZW Unisys Patent Information
The LZW Patent is expired, here is proof from Unisys themselves.
Wikipedia Description of LZW
Wikipedia Description of LZW

  Files folder image Files  
File Role Description
Accessible without login Plain text file lzwc.php Class The compression class
Plain text file example Example A simple example of the use of this class

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