News Feed
Sections




News Archive
feed this:

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



Community Events

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


extension api opinion language podcast laravel series community interview video development unittest psr7 voicesoftheelephpant release library introduction framework laravel5 conference

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