HHVM 4.102 is released! This release marks the end of support for 4.96; HHVM 4.97–4.101 remain supported, as do the 4.56 and 4.80 LTS releases.

Breaking Changes

• Usage of <<__Override>> is now correctly enforced on methods declared on interfaces (previously it was only enforced on methods declared in classes and traits). The typechecker will raise an error if the attribute is used on an interface method that was not declared on any of your interface’s parent interfaces.
• The typechecker now correctly raises an error if a protected method declared in a trait is called from an invalid context. Previously, there was a bug where the typechecker would allow calling the protected method from any class that used the same trait, even if it wasn’t a child or parent of the target class. Such calls would cause a runtime error but previously wouldn’t be caught by the typechecker.

Future Changes

• In the future, using any of the arithmetic operators (+, -, *, /, %, **) with values of non-numeric types (all types except int and float) will cause an exception to be thrown at runtime. All of these cases already raise typechecker errors.
  • Same rules apply to the respective assignment operators (+=, **=, etc.).
  • The INI option hhvm.notice_on_coerce_for_math=2 can be used to enable the future behavior now (set to 1 to raise a notice instead of throwing an exception).
  • Similar restrictions also apply to the increment and decrement operators ($i++, --$i). The INI option hhvm.notice_on_coerce_for_inc_dec can be used to enable the future behavior for these (set to 1 for notice, 2 for exception).