News Feed
Sections




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

Johannes Schluter's Blog:
HashTables
August 23, 2010 @ 08:58:43

Johannes Schluter has a new post to his blog on another PHP internals related topic - hashtables.

While preparing my "PHP Under The Hood" talk for the Dutch PHP Conference there was a question on IRC about extension_loaded() being faster than function_exists(), which might be strange as both of them are simple hash lookups and a hash lookup is said to be O(1). I started to write some slides for it but figured out that I won't have the time to go through it during that presentation, so I'm doing this now.

He talks about array storage (a "real" array), numeric and string-based keys, the internals of how each is stored and how the differences make the one function faster than the other (hint: it's all about collisions).

0 comments voice your opinion now!
hashtable array storage variable functionexists extensonloaded


blog comments powered by Disqus

Similar Posts

DevShed: The Switch Statement and Arrays

Havard Eide's Blog: Iterators

PHPBuilder.com: Introduction to Arrays and Hashes in PHP - The ABC's of PHP Part 7

Brian Swan's Blog: Accessing Windows Azure Blob Storage from PHP

Paul Jones' Blog: New PDO Behavior In PHP 5.2.1


Community Events





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


tips community install package interview opinion deployment laravel framework voicesoftheelephpant introduction library podcast release series language bugfix api list symfony

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