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From manual page: http://www.php.net/apcu.configuration
The documentation for the APCu Runtime Configuration has references to file opcode caching for apc.slam_defefense, apc.gc_ttl, and possibly for apc.preload_path. As far as I am aware this is outdated as APCu provides no opcode caching.
If I knew what the documentation should say, I would correct it, but I'm not familiar with the codebase at all.
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