Following are the list of available features in PHP7
1. Scalar type declarations
2. Return type declarations
3. Null coalescing operator
4. Spaceship operator
5. Constant arrays using define
6. Annonymous classes
7. Unicode codepoint escape syntax
8. Closure::call
9. Filtered unserialize
10.IntlChar
11. Expectations
12. Group use declarations
13. Generator Return Expressions
14. Generator delegation
15. Integer divison with intdiv
16. Session options
17. preg_replace_callback_array
18. CSPRING functions