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I was wondering about caching dynamic PHP pages. Is it really about pre-compiling the PHP code and storing it in byte-code? Something similar to Python’s .pyc which is a more compiled and ready to execute version and so that if the system sees that the .pyc file is newer than the .py file, then it won’t bother to re-compile to .py file.
So is PHP caching mainly about this? Can someone offer a little bit more information on this?
Depends on the type of caching you are talking about. Opcode caching does exactly like you are saying. It takes the opcode and caches it so that whenever a user visits a particular page, that page does not need to be re-compiled if its opcode is already compiled and in the cache. If you modify a php file the caching mechanism will detect this and re-compile the code and put it in the cache.
If you’re talking about caching the data on the page itself this is something different altogether.
Take a look at the Alternative PHP Cache for more info on opcode caching.