关于php编译缓存机制
我用stat查看某个php文件看到只有第一次访问被记录，说明这个php解释器在这个文件未被修改的情况下只会编译一次对不对？
求大神解释一下php的编译缓存机制
回复内容：
我用stat查看某个php文件看到只有第一次访问被记录，说明这个php解释器在这个文件未被修改的情况下只会编译一次对不对？
求大神解释一下php的编译缓存机制
你说的这个不是PHP的缓存机制,而是Linux操作系统的文件系统缓存机制,就是free -m看到的buffers/cache占用的内存.PHP解释器(PHP-FPM)第一次访问PHP脚本文件后,这个文件就已经载入到内存,而操作系统会把频繁访问的文件维持在内存buffers/cache中,这样PHP再次读这个文件的时候就不需要读磁盘了.
对于PHP解释器来说,仍是需要每次解析脚本内容并执行生成的opcode.
不过PHP的ZendOpcache扩展提供了楼主你想要的缓存机制:
ZendOpcache会把第一次请求的脚本对应的opcode保存在内存,供下一次请求直接执行.
PHP7的ZendOpcache甚至还支持导出脚本的opcode,一定程度上还可以实现源代码保护.
提个不相关的事儿:
ext3/4 文件系统中 atime 的更新可以通过 mount 的参数关掉, 某些情况下可以调高性能.
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