什么是字节码缓存?如何在PHP中使用字节码缓存? [英] What is a bytecode cache and how can I use one in PHP?
问题描述
我在网上搜索后发现，可以对PHP代码进行编译以提高性能. 但是该怎么做呢? 我可以同时编译过程式和面向对象的PHP代码吗?
I searched on the Web and came to know that PHP code can be compiled to have performance boost. But how to do it? Can I compile both procedural and object oriented PHP code?
推荐答案
执行PHP脚本时的基本思路分两个步骤:
The basic idea, when executing a PHP script is in two steps :
- 首先:用纯文本格式编写的PHP代码编译为操作码
- 然后:执行这些 opcode .
- First: the PHP code, written in plain-text, is compiled to opcodes
- Then: those opcodes are executed.
当您拥有一个PHP脚本时，只要不对其进行修改，操作码将始终相同；因此，每次执行脚本时都要进行编译阶段，这是在浪费CPU时间.
When you have one PHP script, as long as it is not modified, the opcodes will always be the same ; so, doing the compilation phase each time that script is to be executed is kind of a waste of CPU-time.
为防止这种冗余编译，可以使用一些操作码缓存机制.
To prevent that redundant-compilation, there are some opcode caching mechanism that you can use.
将PHP脚本编译为操作码后，这些将保存在RAM中-下次执行该脚本时可直接从内存中使用这些操作码；阻止编译一次又一次地完成.
Once the PHP script has been compiled to opcodes, those will be kept in RAM -- and directly used from memory the next time the script is to be executed ; preventing the compilation from being done again and again.
最常用的操作码缓存是 APC-备用PHP缓存:
The opcode cache which is used the most is APC - Alternative PHP Cache :
一旦正确安装并配置了APC，您就无需在PHP代码中进行任何修改:APC将缓存操作码，仅此而已-该过程对于您的应用程序是完全不可见的.
Once APC has been installed and configured properly, there is nothing you have to modify in your PHP code : APC will cache the opcodes, and that is all -- the process is totally invisible for your application.
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