Home Backend Development PHP Tutorial PHP性能优化贴士——发作高度优化代码

PHP性能优化贴士——发作高度优化代码

Jun 13, 2016 am 10:54 AM
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PHP性能优化贴士——产生高度优化代码

PHP是一种在服务器端执行的脚本语言,它开发了世界上许多知名的网站,包括雅虎和Facebook等。下面介绍6条PHP代码、性能优化的技巧。

1.将PHP升级到最新版

??? 提高性能的最简单的方式是不断升级、更新PHP版本。

2.使用分析器

??? 网站运行缓慢的原因颇多,Web应用程序极其复杂,让人扑朔迷离。而一种可能性在于PHP代码本身。这个分析器可以帮助你快速找出造成瓶颈的代码,提高网站运行的总体性能。

??? Xdebug PHP extension提供了强大的功能,可以用来调试,也可以用来分析代码。方便开发人员直接跟踪脚本的执行,实时查看综合数据。还可以将这个数据导入到可视化的工具 KCachegrind中。

3.检错报告

??? PHP支持强大的检错功能,方便你实时检查错误,从比较重要的错误到相对小的运行提示。总共支持13种独立的报告级别,你可以根据这些级别灵活匹配,生成用户自定义的检测报告。

4. 利用PHP的扩展

??? 一直以来,大家都在抱怨PHP内容太过繁杂,最近几年来开发人员作出了相应的努力,移除了项目中的一些冗余特征。即便如此,可用库以及其它扩展的数量还是很可观。甚至一些开发人员开始考虑实施自己的扩展方案。

5.使用PHP加速器

??? 一般情况下,PHP脚本被PHP引擎编译后执行,会被转换成机器语言,也称为操作码。如果PHP脚本经过反复编译而得到相同的结果,那为什么不完全跳过编译过程呢?

??? 通过PHP加速器,你完全可以实现这一点,它缓存了PHP脚本编译后的机器码,允许代码根据要求立即执行,而不经过繁琐的编译过程。

??? 对PHP开发人员而言,目前提供了两种可用的缓存方案,一种是APC(Alternative PHP Cache,可选PHP缓存),它是一个可以通过PEAR安装的开源加速器。另一种流行的方案是Zend Server,它不仅提供了操作码缓存技术,也提供了相应页面的缓存工具。

6.通过内存缓存来避免高成本操作

?? PHP通常在检索和数据分析方面扮演着重要角色,这些操作可能会导致性能降低。实际上有些操作是完全没有必要的,特别是从数据库中反复检索一些常用的静态数据。不妨考虑一下短期使用 Memcached extension来缓存数据。Memcached的扩展缓存与libMemcached库协同工作,在RAM中缓存数据,也允许用户定义缓存的期限,有助于确保用户信息的实时更新。

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