You can control the maximum size of the cache by using the command line option in Listing 1, but note that this maximum size may be constrained by operating system restrictions on shared memory
可以使用清单 1 中的命令行选项控制缓存的最大大小，但是请注意，这个最大大小可能受到操作系统共享内存限制的约束
The PHP bytecode (opcode) cache is used to store the compiled script bytecode in shared memory so that it can be re-used by PHP engine for subsequent executions of the same script.
PHP的二进制代码（操作码）缓存用来存储在共享内存中的字节码编译的脚本，以便它可以重新通过PHP引擎，用于后续执行相同的脚本。
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