Creación de ENUMS para la aplicación

Genial, esto es nuevo desde la version PHP 8.

De acuerdo a la documentacion:

Enumerations, or “Enums” allow a developer to define a custom type that is limited to one of a discrete number of possible values. That can be especially helpful when defining a domain model, as it enables “making invalid states unrepresentable.”

Enums appear in many languages with a variety of different features. In PHP, Enums are a special kind of object. The Enum itself is a class, and its possible cases are all single-instance objects of that class. That means Enum cases are valid objects and may be used anywhere an object may be used, including type checks.

Si tienen algún linter o complemento que les revise la sixtansis del código, es posible que les marque error al realizar el enum, si tienen php 8.0.25 les va a marcar ese error. Solo actualicen a 8.1 o 8.2 y listo.