HHVM 4.4 is released! This release will be supported for 6 weeks, and HHVM 4.1+ remain supported.

This weeks’ work was mostly performance improvements, bug fixes, and work on future features.


  • Improved error messages for variadic functions that are not passed enough arguments
  • Fix support for hh_server --config, allowing overriding hhconfig options via the CLI

Breaking Changes

  • __callStatic() is no longer supported; if manual analysis is not practical for migration, we recommend adding logging wrappers while using a previous version of HHVM.
  • ext_session and the $_SESSION superglobal have been removed

Other Notes

  • The hhvm.jit_profile_interp_requests option has been removed, as it no has any effect