features of PHP7
1)Scalar type hints
2)Return type declarations
3)Anonymous classes
4)The Closure::call() method
5)Generator delegation
6)Generator return expressions
7)The null coalesce operator
8)The space ship operator
9)Throwables
10)Level support for the dirname() function
11)The Integer division function
12)Uniform variable syntax
For More information
https://feryn.eu/blog/php-7-is-now-available-new-features-improvements/