问题描述
缺乏经验的PHP问题：
An inexperienced PHP question:
我有一个PHP脚本文件，我需要在很多地方多次包含在不同的页面上。
I've got a PHP script file that I need to include on different pages lots of times in lots of places.
我可以选择将包含的文件分解为几个较小的文件，并根据需要包含这些文件......或者......我可以将它们全部保存在一起在一个PHP文件中。
I have the option of either breaking the included file down into several smaller files and include these on a as-needed basis... OR ... I could just keep it all together in a single PHP file.
我想知道在这种情况下是否对include（）使用更大的文件和更小的文件有什么性能影响？例如，200KB文件和20KB文件之间是否有任何性能差异？
I'm wondering if there's any performance impact of using a larger vs. smaller file for include() in this context? For example, is there any performance difference between a 200KB file and a 20KB file?
谢谢。
推荐答案
在200KB到20KB的文件之间会有区别......但你可能不会注意到它：200KB的文件不是那么大 - 你通常会使用很多文件当你构建一个大型应用程序时，文件不是小。
There will be a difference, between a 200KB and a 20KB file... But you will probably not notice it : a 200KB file is not that big -- and you generally use a lot of files that are not "small", when you're building a big application.
当你加载一个<$ c $时，有两件事需要时间c> .php file：
There are two things that take time, when you're loading a .php file :
- PHP源代码被编译为opcodes - 这相当于JAVA字节码
- 每次包含PHP文件时都会这样做，默认
- 但是，使用像这样的操作码缓存，这些操作码可以保存在内存中，这个编译的东西每次都没有完成 - 这很棒：它意味着更少的CPU使用，因为编译将会不再做了（它只会在一段时间内完成）。
- The PHP source code is "compiled" to "opcodes" -- that's quite equivalent to JAVA bytecode
- This is done each time a PHP file is included, by default
- But, using some opcode cache like APC, those opcodes can be kept in memory, and this compilation stuff not done each time anymore -- which is great : it'll mean less CPU used, as the compilation will not be done anymore (it'll be done only once in a while).
- 根据脚本的内容，这可能需要一些时间，或者不需要：
- 如果只是文件包含函数或类定义，这不会花费太多时间：什么都不会执行。
- 如果文件包含说明，则需要更多时间^^
作为一个注释：在一般情况下，你会获得很多更多的时间/ CPU /资源优化您的SQL查询，或添加一些缓存机制，而不是考虑那种东西。
As a sidnote : in a general situation, you'll gain a lot more time/cpu/resources optimizing your SQL queries, or adding some caching mecanism, than thinking about that kind of stuff.这篇关于PHP include（）：文件大小&性能的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！