HHVM 4.129 is released! This release marks the end of support for 4.123; HHVM 4.124–4.128 remain supported, as do the 4.102 and 4.128 LTS releases.

Highlights

• hackfmt --in-place (or -i) no longer writes to files that do not have formatting changes.
• added hackfmt --check-formatting which, given a list of files, prints which files would be modified by hackfmt --in-place.
• hackfmt now correctly handles multi-line string literals.
• fixes DateTimeZone::listIdentifiers() returning an empty set.
• fixes the UTC timezone not being recognized.

Breaking Changes

• isset() no longer permits inout arguments.
• Many built-in exceptions including RuntimeException and LogicException now extend the new ExceptionWithPureGetMessage class; all descendents that override getMessage() must mark it as pure, e.g. getMessage()[].