- Added new json_encode() option JSON_UNESCAPED_UNICODE.
- Added support for object-oriented session handlers.
- ext/mysql, mysqli and pdo_mysql now use mysqlnd by default.
- Removed the timezone guessing algorithm in case the timezone isn't set with date.timezone or date_default_timezone_set(). Instead of a guessed timezone, "UTC" is now used instead.
- Added callable typehint.
This is a development preview...
DO NOT USE IT IN PRODUCTION!
Read the NEWS file for a complete list of changes.
I have been looking forward to the stable appearance.