Interface Changes

.. note:: As long as you have not extended the relevant CodeIgniter core classes or implemented these interfaces, all these changes are backward compatible and require no intervention.

AutoRouterInterface

Now AutoRouterInterface::getRoute() has the new second parameter string $httpVerb.

ValidationInterface::check()

The second parameter has changed from string $rule to $rules.
The optional fourth parameter $dbGroup = null has been added.

Method Signature Changes

Validation::check()

The second parameter has changed from string $rule to $rules.
The optional fourth parameter $dbGroup = null has been added.

Deprecations

AutoRouterImproved: The constructor parameter $httpVerb is deprecated. No longer used.

Bugs Fixed

Validation: Fixed a bug that $DBGroup is ignored when checking the value of a placeholder.
Validation: Fixed a bug that check() cannot specify non-default database group.
Database: Fixed a bug where semicolon character (;) in one of the Postgre connection parameters would break the DSN string.
AutoRouting Improved: Fixed a bug that feature testing may not find controller/method.

See the repo's CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>_ for a complete list of bugs fixed.