Could you provide what was tested, please?
Knowing PHP 5.4 there is a lot of difference. Iteration for example is quiet similar in terms of speed, whereas $obj->key and $obj->key = $value are slightly faster in comparision.
$obj->key = $value
This is just the verbose data from the blog post I wrote which includes what was run and my thoughts on this: http://www.lornajane.net/posts/2012/proof-that-php-5-4-is-twice-as-fast-as-php-5-3
The data above is meaningless on its own, I'm not sure how it was linked to directly :)
Thank you. Can't see how it worked, but google seems to like it a lot.