...Use PHP7strong typing (strict mode). Support for more PSRspecifications. Native multi-app support. More powerful and easy-to-use queries. Brand new event system. Model events and database events are unified into the event system. Template engine separates out the core. Middleware for internal functions. SESSION/Cookie mechanism improvement. Improved support for Swoole and coroutines. More friendly to IDE. Unify and streamline a large number of usages. ThinkPHP is released under the Apache2 open source agreement and is available for free.