APC cause problems

看技术文档的时候很多作者的警告明知很重要，但经常被我们当作耳边风。不是我们有意把它们忘记，只是很多事情只是经历过之后才能铭记在心。

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APC will probably be 20-30% faster, but if you are writing to it frequently it can cause problems. The APC cache is best for things that change very rarely. And by very rarely I mean days, not hours or minutes.

Because of the way APC does an anonymous file-backed mmap where I unlink the file at startup to get process-death protection, it isn’t easy to get at the cache from a separate standalone command line script. That can be solved by mmap’ing slightly differently, but in the default config your approach won’t work.

-Rasmus
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apc不适合用于缓存经常改动的内容。如果你的代码经常改动，最好先禁用cache.或者修改后清空一下缓存。