Consequently, HHVM will not aim to target PHP7. The HHVM team believes that we have a clear path toward making Hack a fantastic language for web development, untethered from its PHP origins.
And because a few people have asked me this recently, while HHVM usage is not included above in the graph it is at 0.36% which is a third of PHP 5.3 usage and really hardly significant. I personally think it's fine to support it still in libraries if it just works, or if the fixes involved are minor. If not then it's probably not worth the time investment.
Comment 的地方有註明這是扣掉 CI 的量：
@ocramius: These numbers ignore Travis CI and other CI systems that set the "CI" env var in their workers. Without excluding those HHVM is around 0.95% so it's still low but those .36% is probably actual usage.
這樣就放心可以完全不用管 HHVM 了 XDDD