HHVM 4.108 is released!
HHVM 4.103–4.107 remain supported, as do the 4.80 and 4.102 LTS releases.Highlights The
Hack Standard Library
is now a built-in part of HHVM. Hack projects can now call any HSL functions
without downloading and installing any extra packages.
which is no longer considered experimental. Other parts of
are not yet included.
Constraints (as/super) on abstract
are now supported.
The HHVM runtime currently doesn’t allow using
with a private or protected method (even within the same class hierarchy),
but these runtime errors are not detected by the Hack typechecker. A new
.hhconfig option, meth_caller_only_public_visibility = true, can be used
to raise Hack errors in these cases. However, the plan is to support private
and protected methods in meth_caller() in the future, at which point this
.hhconfig option will become unnecessary.Future Changes Functions in the Str\ namespace in the (now built-in) Hack Standard Library
will no longer respect the system/request locale. Instead, they will default
to using the
POSIX (also known as C) locale.
In the future, we expect most of them to accept additional parameter(s)
overriding the default locale and encoding, but these may not be available
Removing the dependency on a global locale setting will allow these
functions to be considered “pure” (they can be called from other functions
including an empty context list).
HHVM (HipHop Virtual Machine)会将PHP代码转换成高级别的字节码（通常称为中间语言）。然后在运行时通过即时（JIT）编译器将这些字节码转换为x64的机器码