Thanks
If you're using APC (or some other opcode cache) you can store it in memory. APC Increment would be helpful http://ca.php.net/manual/en/function.apc-inc.php, there's similar features for memcached or other services.
Beyond that, it needs to go somewhere, on disk (in a file or a DB), or in memory. There's no built in persistant store with PHP itself (though many opcode caches provide it).
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