7.4
- Typed Properties.
- Arrow Functions.
- Numeric Literal Separator – Can use underscores to visually format numbers.
- New magic methods to replace old serialization methods:
__serialize()
and__unserialize()
. - Covariant Returns and Contravariant Parameters.
- Deprecations
- Ternary Operator Left Associativity deprecated.
5.3
- Namespaces.