README

A small compression/decompression library for numerical arrays. Its best suited for large data sets of integers.

How it works

Internally this lib creates a delta encoded array and then deflates it using zlib.

Delta encoding is one of the most powerfull numeric compression methods out there. Its a simple algorithm that converts values in given array so that each represents a difference from the previous value.

Delta encoding example:

[100, 101, 102, 103, 104, 105] converts to [100, 1, 1, 1, 1, 1] 

Charts

(the more sequential data the better compression ratio)

Mini DOC

Compression

Numco::compress(array) : string expects array of numbers as argument and returns compressed base64 encoded string 

Decompression

Numco::decompress(string) : array expects compressed base64 encoded string and returns decompressed array of numbers 

Composer Installation

$ composer require inelo/numco 

Example usage

use Inelo\Numco\Numco; $numArray = [ 100, 101, 102, ... ]; $compressed = Numco::compress($numArray); $decompressed = Numco::decompress($compressed); echo "compressed base64 encoded string : " . $compressed . "\n"; echo "decompressed array : " . var_export($decompressed, true) . "\n"; 

Running tests

vendor/bin/phpunit tests

Release History

• 1.0.0 Initial release