Interesting observation! If you're sorting an array, yes, that would make a big difference. However, the purpose of usort() here was to provide a direct comparison between objects and arrays, so they had to be used in the same way. That meant usort() so that we could compare the property access in each. I didn't as much care about the sorting itself as sorting was an easy way to call $array['a'] and $object->a a few zillion times. :-)
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