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HomeBackend DevelopmentPHP Tutorial 拔高PHP代码的性能10条建议

提高PHP代码的性能10条建议

这篇文章中的建议涵盖了大部分PHP 代码性能方面的问题。如果你是做一些小网站或者小项目,那么有理由忽略这些 建议,但是当你为大量用户提供长期稳定的服务的时候,就必须关注了。开发人员必须从项目一开始就考虑这些建议,它会极大的改善你的网站的性能。 在PHP中,通常有很多的方法可以来达到相同的目的,但是开发人员通常选择他们最熟悉的用起来最舒服的一种方式,但是有些事必须注意的:

1.echo比print要快很多。两个方法都会在页面上打印东西,不过echo不返回任何值,print会在成功或失败的时候返回0或1。

2.include_once比include更加耗时。因为它需要去检查你要包含的class是否已经被包含进来。

3.对于长段落的字符串一定要使用单引号,而不是双引号。因为双引号会去搜索字符串中的变量。比如:echo ‘This is long string’.$name就比echo “This is long string $name”要快很多。

4.不要再循环中使用for($i=0;$i

5.如果能将函数定义为静态的,那么就不要定义成为成员函数,静态函数比成员函数快33%。

6.如果你可以不通过正则表达式就能解决问题,那么就别用正则。正则表达式比PHP原生的函数要慢一些。例如使用str_replace取代preg_replae。

7.尽量不要使用相对路径来包含文件。在相对路径中查找文件,会现在当前目录中查找,然后依次再查找。这样查找文件就很慢。最好是先定义WEB_ROOT这样的常量,然后使用这个常量来包含文件。

8.全等符号===比相等==要快。而且if(1 == ’1′)会返回true,if(0 == ”)也会返回true,而当你使用全等符号的时候if(1 ===’1′)和if(0===”)都会返回false。所以当你在程序中需要检测一些布尔变量的时候最好使用全等符号。

9.最好别用简写的

10.最好不要使用和依赖于register_global或者magic_quote,读取和设置你的php.ini的时候也一定要小心。

这里并没有涵盖所有的优化方面,RockUX会在后面的文章中讲到。请多多关注。

希望通过本文的介绍,能给你的带来帮助。

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