Class: LZW (compress, TIFF, compression)

Supplied by:

Name:	Sam Shull `<e-mail contact>`
Published packages:	3
Country:	United States - PHP jobs in United States
Home page:	`http://samshull.com/`
Age:	31
All time rank:	1335
Week rank:	540

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Innovation Award:

PHP Programming Innovation award nominee

August 2007
Number 7

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

Groups:

	Algorithms	Numerical and statistical algorithms	View top rated classes
	Compression	Data compression and file archive manipulation	View top rated classes

Detailed description:

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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Related links:

Link	Description
LZW Unisys Patent Information	The LZW Patent is expired, here is proof from Unisys themselves.
Example	An example in use on my website
Wikipedia Description of LZW	Wikipedia Description of LZW

Files:

File	Role	Description
`lzwc.php`	Class	The compression class
`example`	Example	A simple example of the use of this class

Download all files: lzwc.tar.gz lzwc.zip

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Class: LZW

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