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Re:Speeding up PHP with the HipHop VM by kmavm on Thursday November 29, 2012 @06:13PM (#4850878)
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.

Re:Speeding up PHP with the HipHop VM by dkhenry on Thursday November 29, 2012 @10:51PM (#4851743)
This makes me sad. That's one of the nicest features of 5.4 not needing to type array() all over the place.
Re:Speeding up PHP with the HipHop VM by debacle on Friday November 30, 2012 @09:08AM (#4853264)
It's a relatively trivial feature to implement (really just syntactical sugar), it probably just wasn't prioritized.