PHP 7.1.x builds upon 7.0.x, adding new features (so far)
* Iterable type.
* HTTP/2 Server Push Support in ext/curl & other ext/curl improvements
* Fix inconsistent behavior in $this variable
* Square bracket syntax for array destructuring assignment
* Create closure from callable
* More precise float values
* Asynchronous Signal Handling (without ticks) in ext/pcntl.
* Additional Context in pcntl_signal Handler
NOTE: this is BETA, not suitable for production environment
