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Subject: Re: [PHP-DEV] Is it possible introduce HHVM into PHP kernel tree?
From: pollita@php.net (Sara Golemon)

> It's my understanding that HHVM is incomplete, as well. Does HHVM implement
> the full basic functionality of PHP? Are there still things which don't work
> for performance reasons?
>
Syntax: Yes, HHVM is an equivalent engine.*
Runtime Library: This is the big gap.  PHP has a bunch of bundled
extensions and a massive library of PECL extensions.  Since the
extension API is very different, each extension has to be
reimplemented, and not all of them have been.

-Sara

* Actually HHVM hasn't finished finally yet, but that's very new in
PHP.  Also, there are a couple small areas where HHVM intentionally
differs from PHP.