News Feed
Sections




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

SitePoint PHP Blog:
How to Create a Unique 64bit Integer from String
August 14, 2014 @ 12:55:33

In the latest post to the SitePoint PHP blog Vova Feldman shows you how to create an integer from a hash string that's both 64 bit and unique each time it's generated.

PHP provides the popular md5() hash function out of the box, which returns 32 a hex character string. It's a great way to generate a fingerprint for any arbitrary length string. But what if you need to generate an integer fingerprint out of a URL?

He describes the real-world situation he was facing - a rating widget that needed a randomized integer based on the page using it - and the two "sub-challenges" that make it up: url canonization and the string to unique 64 bit problem. He tackles each problem and shares code snippets showing the process and how it can be put to use. He also includes some interesting metrics at the end of the post showing the level of hash collisions (hint, it's a very low number).

0 comments voice your opinion now!
unique integer string 64bit tutorial md5 hash

Link: http://www.sitepoint.com/create-unique-64bit-integer-string/

blog comments powered by Disqus

Similar Posts

Rafael Dohms' Blog: Debugging PHPUnit Tests in NetBeans with XDebug

Jani Hartikainen's Blog: Unit testing 5: test-driven development

Community News: PHP The Right Way adds Dependency Injection Information

Stefan Mischook's Blog: PHP Classes and Objects video tutorial

Gonzalo Ayuso's Blog: Pivot tables in PHP


Community Events





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


list release podcast interview version configure framework voicesoftheelephpant composer opinion introduction series community laravel conference api extension install unittest symfony

All content copyright, 2015 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework