PHP 7.2.x builds upon 7.1.x, adding new features:
* Argument type declarations
* Object return type declarations
* Parameter Type Widening
* Trailing commas in list syntax
* Argon2 in password hash
* Libsodium as part of PHP Core
* Deprecated: __autoload, $php_errormsg, create_function(),
mbstring.func_overload, parse_str() without second argument,
gmp_random(), each(), assert(), $errcontext
* uniqid() patch to avoid usleep() integrated, 10000x improvement on NetBSD,
about 10x on Linux
