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

Johannes Schluter's Blog: MySQL Storage Engine based on PHP

Matthew Turland's Blog: EAV Modeling - Square Peg in a Round Hole?

Patrick van Kouteren: CloudVPS object store beta introduction

Davey Shafik's Blog: Return Values

DevShed: Using Advanced Functions to Maintain the State of Applications with PHP Sessions


Community Events

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


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

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