Except APC doesn't actually serialize anything except for objects. Arrays and scalar types are directly memcpy'ed in and out of the APC user cache. But this author is extremely confused. I think he may have confused APC with Memcache here. They have done some work on the PHP Memcache extension to remove the need to serialize making it behave more like APC.
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I think they're referring to how APC serializes data structures internally, not the serialize() function. I might be wrong, but that's how I read it.
edit: https://github.com/facebook/hiphop-php/wiki/Unimplemented-Fu...
That's a list of unimplemented functions - unserialize_callback_func is unimplemented, but that's it wrt serialization functions.
Except APC doesn't actually serialize anything except for objects. Arrays and scalar types are directly memcpy'ed in and out of the APC user cache. But this author is extremely confused. I think he may have confused APC with Memcache here. They have done some work on the PHP Memcache extension to remove the need to serialize making it behave more like APC.