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