...PHP language research

Is anyone doing anything interesting at all with the PHP language? I understand it's poorly designed but it feels like you can at least do some design-by-contract stuff in it, or have some funky functional programming style stuff implemented in it.

Here's someone's example of Design-by-contract in PHP.

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try googling for

"dci php" if that counts?
(yahoo search didn't turn up results as nicely.)

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Project page

What's the DCI part mean?

This is explained on, for example, the project page for php-coredci, which turns up when you Google "DCI PHP".