1. Scalar Type Hints (PHP 7.0)
2. Return Type Hints (PHP 7.0)
3. Anonymous Classess (PHP 7.0)
4. Generator Delegation (PHP 7.0)
5. Generator Return Expressions (PHP 7.0)
6. Null Coalesce Operator (PHP 7.0)
7. Spaceship Operator (PHP 7.0)
8. Constants Array (PHP 7.0)
9. Throwables (PHP 7.0)
10. Group use Declaration (PHP 7.0)
11. Catching Multiple Exceptions Types (PHP 7.1)
12. Class Constant Visibility Modifiers (PHP 7.1)
13. Iterable Pseudo-Type (PHP 7.1)
14. Nullable Types (PHP 7.1)
15. Void Return Types (PHP 7.1)