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In PHP 5.5 and up there will be a built-in opcode caching mechanism, making that part of APC obsolete. The user-cache has been forked into APCu, which will use
apcu_ functions. I think it will take a while before PHP 5.5 is used widely, but I think it is good for the module maintainers to be aware of the fact that APC may change in the future.