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: Introducing the Memento Pattern

LivePipe Blog: What PHP6 Actually Needs

Matthew Weir O'Phinney's Blog: Zend_Form Advanced Features

Paul Jones' Blog: Solar Views and Layouts

Johannes Schluter's Blog: HashTables


Community Events

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


composer example api voicesoftheelephpant configure performance library symfony2 laravel interview podcast opinion community conference framework php7 release introduction application series

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