Filesystem driver: allow different serialization methods about stash HOT 3 CLOSED

I agree. I would recommend a change to JSON, to allow cross-language support for the same cache source.

OpCode is a pain with PHP "data" files.

#135

We should do some benchmarking to figure out whether OpCache or APC really saves that much time with regards to the PHP data file (Also we can't even use OpCache for the files anyway due its "caching the cache"). If not, then it's safer to avoid using PHP and use another data storage file format.

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I'm not going to lie, this isn't something I'm going to have a lot of time to work on. If one of you guys wanted to make the pull request I would be happy to look at it, and based off of what you've said so far I won't have any issues approving it.

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So I've got a pull request together that somewhat solves this. I tried going with JSON but was receiving way too many errors with data integrity. Admittedly this was mostly with larger numbers that people are unlikely to encounter in most cases, but for now I'm settling on the php serialization functions as alternative to php source files.

This update also creates a new interface and the ability to inject Encoder classes into the FileSystem driver in case people want to do custom back ends, which should handle your suggested use cases pretty well @gggeek.

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