News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Joshua Thijssen's Blog:
Bloom Filters
April 09, 2012 @ 11:13:32

In this new post to his blog Joshua Thijssen describes something that can help when processing large amounts of data (like, in his example, the text of a book) to search through the information and find if a certain piece of data is in the set - a bloom filter.

Most of my co-workers never really heard of bloom filters, and I'm continuously need to explain what they are, what their purpose is and why it's a better solution than other ones. So let's do an introduction on bloom filters. [...] Bloom filters have the property of being exceptionally fast AND exceptionally small compared to other structures but it comes with a price: it MIGHT be possible that our bloom filter thinks that an element is inside our set, when it really isn't. Luckily, the reverse is not possible: when a bloom filter says something is NOT in the set, you are 100% sure that it isn't part of the set.

He explains how the filter works, noting how it's better for memory consumption and how it's possible for it to give a "maybe" response instead of ab absolute "yes" or "no". He also points out a PHP extension, bloomy that takes the hard work out of it for you.

0 comments voice your opinion now!
bloom filter search memory consumption speed


blog comments powered by Disqus

Similar Posts

Joshua Thijssen's Blog: Bloom Filters

Community News: Finally, Phorum 5.2 has made it to stable!

Builder.com: Search and map directory trees with ease using the right PHP class

Rob Allen: Overriding the built-in Twig date filter

Chris Shiflett\'s Blog: PHP Blogs Not on Planet PHP


Community Events





Don't see your event here?
Let us know!


artisanfiles laravel introduction voicesoftheelephpant framework podcast security series conference symfony library opinion version composer language interview community release list tool

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework