HHVM 4.163 is released! 4.160 - 4.162 remain supported, as do the 4.128 and 4.153 LTS releases.

Highlights

• Added HH\str_bitwise_xor to perform bitwise xor operator on strings
• Relax restriction that prevents defaults and concrete type definitions with the same name in the same hierarchy. e.g. the following code now type checks:

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  interface I1 {
    const type T = int;
  }
  interface I2 {
    abstract const type T = float;
  }
  class C implements I1, I2 {}
  

Breaking Changes

• Removed the support to instance methods in Expression Trees