Comments on: PHP : Variables vs Constants http://planetozh.com/blog/2006/06/php-variables-vs-constants/?source=rss A bit of my personal life, mainly focused on my kids. A bit of code, mainly focused on Wordpress and PHP. Overall, bits of nothing in particular. Sat, 11 Oct 2008 22:52:04 +0000 http://wordpress.org/?v=2.6.2 By: Adriano http://planetozh.com/blog/2006/06/php-variables-vs-constants/#comment-78516 Adriano Fri, 10 Oct 2008 11:12:39 +0000 http://frenchfragfactory.net/ozh/archives/2006/06/01/php-variables-vs-constants/#comment-78516 unbelievable!!! so? should we use variables? unbelievable!!!

so? should we use variables?

]]> By: PHP Sidor » Blog Archive » Snabbast i PHP - variabler eller konstanter http://planetozh.com/blog/2006/06/php-variables-vs-constants/#comment-37700 PHP Sidor » Blog Archive » Snabbast i PHP - variabler eller konstanter Sun, 12 Aug 2007 19:22:21 +0000 http://frenchfragfactory.net/ozh/archives/2006/06/01/php-variables-vs-constants/#comment-37700 [...] är egentligen snabbast, är det nÃ¥gon störra skillnad? Jag sÃ¥g en bloggpost om detta, men kom fram till att jag ska fortsätta med arrayer eftersom det inte verkar vara nÃ¥gon större [...] [...] är egentligen snabbast, är det nÃ¥gon störra skillnad? Jag sÃ¥g en bloggpost om detta, men kom fram till att jag ska fortsätta med arrayer eftersom det inte verkar vara nÃ¥gon större [...]

]]> By: lf http://planetozh.com/blog/2006/06/php-variables-vs-constants/#comment-20415 lf Tue, 06 Jun 2006 21:57:50 +0000 http://frenchfragfactory.net/ozh/archives/2006/06/01/php-variables-vs-constants/#comment-20415 j'aime bien ton blog, y a pleins de trucs ou je comprends rien, et en plus c'est en anglais, alors ça me rassure. j’aime bien ton blog, y a pleins de trucs ou je comprends rien, et en plus c’est en anglais, alors ça me rassure.

]]> By: Roland Hesz http://planetozh.com/blog/2006/06/php-variables-vs-constants/#comment-16265 Roland Hesz Fri, 02 Jun 2006 08:11:58 +0000 http://frenchfragfactory.net/ozh/archives/2006/06/01/php-variables-vs-constants/#comment-16265 I use constants, mainly to avoid magic numbers, and for values that I use in a lot of places, but can change [urls, directories, filenames, etc.], so I won't forget to change one instance out of 10 :) I use constants, mainly to avoid magic numbers, and for values that I use in a lot of places, but can change [urls, directories, filenames, etc.], so I won’t forget to change one instance out of 10 :)

]]> By: BB2k http://planetozh.com/blog/2006/06/php-variables-vs-constants/#comment-16264 BB2k Fri, 02 Jun 2006 08:08:33 +0000 http://frenchfragfactory.net/ozh/archives/2006/06/01/php-variables-vs-constants/#comment-16264 lol at the antispam =) The difference between variables and CONSTANTS is really an advantage when you use compiled language since the CONSTANT is evaluated one time (at the compilation). this is the matter of the some optimisations algorithms that replace know variables in fonctions to speed up them. ie . if in C=A+3, A as a knonw value of 3 in this environnement (yes actually this is a constant, but only in a given envirronment) then the code will be transformed in C=6. In an intepreted language like php, the CONSTANt is replaced each time you run the code and then the optimisation is not so good. It should be better with the use of a pre-compiler like phpaccelerator (http://www.php-accelerator.co.uk/). lol at the antispam =)

The difference between variables and CONSTANTS is really an advantage when you use compiled language since the CONSTANT is evaluated one time (at the compilation). this is the matter of the some optimisations algorithms that replace know variables in fonctions to speed up them.
ie . if in C=A+3, A as a knonw value of 3 in this environnement (yes actually this is a constant, but only in a given envirronment) then the code will be transformed in C=6.

In an intepreted language like php, the CONSTANt is replaced each time you run the code and then the optimisation is not so good. It should be better with the use of a pre-compiler like phpaccelerator (http://www.php-accelerator.co.uk/).

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