https://github.com/caferrari/shuffle

Shuffle a huge amount of numbers
https://github.com/caferrari/shuffle

Last synced: about 2 months ago
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Shuffle a huge amount of numbers

• Host: GitHub
• URL: https://github.com/caferrari/shuffle
• Owner: caferrari
• Created: 2014-01-24T18:02:25.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2014-01-26T21:54:12.000Z (about 11 years ago)
• Last Synced: 2024-10-28T05:39:07.585Z (3 months ago)
• Language: PHP
• Size: 133 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Caf\Shuffle [![Build Status](https://travis-ci.org/caferrari/Shuffle.png?branch=master)](https://travis-ci.org/caferrari/Shuffle)

===========

This lib was made with the objective to shuffle a huge amount of numbers

Performance

-----------

It's a lot slower than the combo range + shuffle functions but it does have a nice memory advantage:

10000000 (10 million) numbers:

    range + shuffe: 1425.28 MB in 9 seconds

    Caf\Shuffle: 38.59 MB in 24 seconds // Exported file: 40MB

100000000 (100 million) numbers:

    range + shuffe: PHP Fatal error:  Allowed memory size of 4294967296 bytes exhausted (tried to allocate 32 bytes)

    Caf\Shuffle: 381.79Mb in 228 seconds // Exported file: 400MB

Advantages

----------

You can export the generated numbers in a nice binary file to be used later or in another place so it becomes more useful

    $r = new Caf\Shuffle\Shuffle(10000000);

    $r->initialize();

    $r->shuffle();

    $r->exportToFile('rand.bin');

It's very easy to reuse later:

    $r = new Caf\Shuffle\Shuffle(10000000);

    $r->loadFile('rand.bin');

    foreach ($r->getIterator() as $number) {

        echo $number . PHP_EOL

    }