There seems to be many people using PHP::Session, which I cannot believe at all ;) Recently several bugfixes on PHP::Session have been made about serialization format thing.
Yet another serialization format I've made for Apache::Session is YAML (with 8 lines of code), which is a generic serialization format for scripting languages like Python, Ruby etc. So it'd be reasonable to use YAML as a session data serialization format. It may allow you to share session data between YAML-supported languages, without nightmares of PHP::Session
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