PHP中定义的效率如何? [英] How efficient is define in PHP?

问题描述

C ++预处理器#define完全不同.

C++ preprocessor #define is totally different.

PHP define()与仅创建var有什么不同吗?

Is the PHP define() any different than just creating a var?

define("SETTING", 0);  
$something = SETTING;

vs

$setting = 0;  
$something = $setting;

推荐答案

'定义'操作本身相当慢-由xdebug分析器确认.

'define' operation itself is rather slow - confirmed by xdebug profiler.

以下是 http://t3.dotgnu中的基准. info/blog/php/my-first-php-extension.html :

• 纯定义"
  380.785 fetchs/sec
  14.2647平均毫秒/首次响应

• pure 'define'
  380.785 fetches/sec
  14.2647 mean msecs/first-response

以'hidef'扩展名定义的常量
930.783 fetchs/sec
6.30279平均毫秒/第一响应

constants defined with 'hidef' extension
930.783 fetches/sec
6.30279 mean msecs/first-response

断开的链接更新

以上引用的博客文章已离开互联网.仍然可以查看类似文章.

The blog post referenced above has left the internet. It can still be viewed here via Wayback Machine. Here is another similar article.

作者引用的库可在此处(apc_define_constants)找到和此处(hidef扩展名).

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