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What version of PHP does HPHP match? 5.3 or 5.4? I ask because I've become very accustomed the short array syntax ([1,2,3]) and other goodies in 5.4.

It is closer to 5.3, though we've adopted some 5.4 features: traits, our closures' treatment of $this, and f()[$x] syntax.

Edit: notably not short array syntax, at least yet.

This makes me sad. That's one of the nicest features of 5.4 not needing to type array() all over the place.

It's a relatively trivial feature to implement (really just syntactical sugar), it probably just wasn't prioritized.