http://hhvm.com/blog/2021/09/07/hhvm-4.126.html

普通更新

HHVM 4.126 is released! This release marks the end of support for 4.120; HHVM 4.120–4.123 remain supported, as do the 4.80 and 4.102 LTS releases.HHVM 4.125 was cancelled due to issues with the release candidate builds.Highlights hh_client --lint FILE is now supported, including several type-aware linters. There is not currently any
configuration or suppression available; please join us in Slack to discuss
potential integration approaches.
Debian 11 (Bullseye) is now supported.
Updated to a newer version of Timelib, fixing support for newer timezone
databases; in some environments, some transitions would be missing.
is/as checks will now invoke the autoloader if required instead of failing.
Improved build system reliability and performance for Hack components used by
the runtime (e.g. the parser).
Added the HH\Lib\Locale namespace, providing:

Locale\create(string $locale)[]: Locale\Locale
Locale\modified(Locale\Locale $base, Locale\Category $cat, string $new): Locale
Locale\c()[]: Locale\Locale (likely to be renamed to Locale\bytes())
Locale\get_native(): Locale\Locale
Locale\set_native(Locale\Locale $locale): void
Locale\from_environment(): Locale\Locale

The new Locale\ functions are intended to be a replacement for the
setlocale() built-in, and to interoperate with future changes to the Str\
namespace.We discourage changing the native locale in most cases (either with setlocale()
or with the new Locale\set_native()) as it can have unexpected results, such as
changing the output of Str\format(), or translating exception messages raised
by some builtins which should usually end up in logs that are read by
developers/administrators instead of users. We have included it to provide a
migration path for existing users of setlocale(), and because it is desirable
in some cases, especially CLI tools.Breaking Changes Ubuntu 20.10 (Groovy) is no longer supported, as it reached end of life in July.Future Changes Str\ HSL functions will start throwing InvalidArgumentException instead of
InvariantException when invalid offsets or lengths are passed. We strongly
recommend against catching either of these exceptions.
In a future release, it will be an error to iterate over most forms of
objects; this can be tested now with the hhvm.throw_on_iteration_over_objects
INI setting. Set to 1 for a notice to be raised, or 2 for an error.

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

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