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HomeBackend DevelopmentPHP Tutorial[转] PHP Performance Optimization

转载自: http://www.laruence.com/2011/05/31/2018.html

作者: Laruence(    ) 本文地址: http://www.laruence.com/2011/05/31/2018.html 转载请注明出处

4月的时候, 做了一个关于PHP性能优化的技术交流.

今天把当时交流的PPT放到slideShare了.

顺便谈一下对PHP性能优化的一些看法.

1. 优化建议目的不是为了优化, 而是为了防微杜渐..

在PPT中罗列的编码时候的优化建议, 不是为了让大家在出现性能问题的时候, 以这些作为准则去对代码进行优化. 而是希望能在大家最初写代码的时候, 就有一个心理的认知, 应该怎么写会更好.

2. 优化的建议不是准则

当我把PPT分享给公司的同事的时候, 会有人质疑, 魔术方法都不让用?

优化的建议, 是建议, 是防止大家滥用, 肆无忌惮的用. 如果你能在写代码的时候, 能意识到, 什么慢, 什么快, 从而避免一些没有必要的对魔术方法的调用, 那就是这个优化建议所追求的效果了

比如, 我在Yaf中, 为视图引擎定义了魔术方法__set, 于是就有些朋友这么来用:

$this->getView()->user = "laruence"; $this->getView()->age = 28; $this->_view->desc = "PHP engineer";

如果是写C, 那么没有问题, 但是在PHP中, 每一个set都是一个函数调用, 所以看过了性能优化建议, 大家能意识到, 其实这个完全可以通过:

$this->getView()->assign(array(       "user" => "laruence",       "age" => 28,       "desc" => "PHP engineer", ));;

来替代, 那就是优化建议所希望达到的效果.

3. 优化建议不是通用的, 是和语言相关的

有很多PHPer以前是写C的, 也可能是写Java的, 虽说语言只是工具, 但是要想用的好, 你还是应该了解工具的特点, 为不同的工具做不同的优化策略.

比如, 对于C来说, 它有一个很强大的编译”优化”器, 可以为你做很多优化, 而PHP是解释型脚本语言, 它只会重视的执行你的代码, 不会做任何优化, 所以, 你写的代码的风格, 直接影响到最终的执行风格.

还有, 对于C来说, 符号在执行器都会变成地址(绝大部分), 而对于PHP来说, 符号都需要经过查找(Hash Lookup)才能使用, 于是我也看到了类似下面的代码:

for ($i=0; i每一次循环, 都会带来6次的Hash Lookup…..

4. 要知根究底
PHP是一个很高级的语言, 使用它可以很方便, 很简洁的完成一些功能.

但是, 追根究底, 它也是最终通过c代码, 继而汇编, 机器码去执行的. 也许看似简单的一条PHP语句, 最终可能需要数十条, 上百条的C语言代码来完成.

而我们, 只有理解到这个过程, 才能真正做到, 在高级语言层面, 做出对底层有正面影响的优化.

Php performance

View more  presentations from  Laruence Hui

 

最后, 如果slideshare被”挡”了,, 点击这里下载看吧: PHP Performance PPT

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