UIDs Controller Resolver

Symfony provides argument value resolvers to transform certain arguments of
controller methods into other objects. That’s how you can get for example the
current request object just by typing any argument with the Response class.

In Symfony 6.1 we’re add a new resolver to transform UID values into UID objects.
For example, in previous Symfony versions you need to do this to get a UUID v4
from a controller argument:

In Symfony 6.1 you can do the same type-hinting the controller argument with the
type of object you want to receive:

Support for Mutation of Constructor Promoted Properties

Starting from PHP 8.0, you can use constructor property promotion to declare
properties directly in the constructor signature. However, you can use PHPdoc
annotations to change the type of the properties. In Symfony 6.1 we’ve improved
the PropertyInfo component to take into account those PHPdoc modifications.

In the following example, the type of $someProperty will be reported as
string instead of mixed:

Backend Enums Controller Resolver

Another controller argument resolver added in Symfony 6.1 allows to transform
arguments into backend enums cases. Take for example the well-known Suit
enum example:

In Symfony 6.1 you can use Suit as the type of the controller argument. If
the route parameter matches any of the enum values, Symfony will inject the
enum case. Otherwise, it will return a 404 HTTP error:

PHPStan Pseudo-Types Support

Thanks to the popularity of static analyzers such as PHPStan, more and more
developers use pseudo-types that describe arguments and return values with more
precision.

For example, instead of string you can use non-empty-string; instead of
int you can use positiveInt; instead of int|float you can use number,
etc. In Symfony 6.1 we’ve improved the PropertyInfo to properly infer the right
PHP type of a variable described with these pseudo-types:

In Symfony 6.1, the PHP type of these properties will be correctly inferred as
integer, array, array and string respectively.