Hi Zeev, the idea one __autoload() may not be capable of loading therefore the next one in the chain should be executed to try to load/define the needed code. bool(false) returned from __autoload() means try with the next in the chain, bool(true) everything went fine skip the rest of the queue.
What I had in mind (primarily to maintain downwards compatibility), is that the engine will check whether the class exists after each call to an autload() callback. If it exists - control returns to the script. If it doesn't - the next autoload() is called. That way we don't need to rely on return values.
Either way, though, the order shouldn't matter...
Zeev
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