* Support for PHP 4 is gone, PHP 5.1 is now a requirement.
* CSRF Protection built into the form helper
* Drivers
* Application Packages
* Scaffolding, having been deprecated for a number of versions, has been removed.
* Removed the deprecated Validation Class.
* Plugins have been removed, in favor of Helpers.
* Added routing overrides to the main index.php file, enabling the normal routing to be overridden on a per “index” file basis.
* Added $route[‘404_override’] to allow 404 pages to be handled by controllers.
* 50+ bugs fixed
Reactor contains all of these above and some nice changes of its own:
* Full query-string support
* Automatic base_url detecion if left blank
* New Cache driver with file system, APC and memcache support
* Command line compatibility for easy cron jobs
* 20+ tweaks and improvements
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