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5. Laravel Enum Casts, Backed Enums, and Value Semantics in PHP 8.3

 Laravel Enum Casts, Backed Enums, and Value Semantics in PHP 8.3
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 PHP 8.3 backed enums combined with Laravel's native enum casting unlock type-safe domain models. Learn how to wire enums into Eloquent, validation, and API resources without ceremony.

 ![](https://cdn.msaied.com/01M22N44A70A5MC2S599JP0MPH.webp) [Mohamed Said](https://www.msaied.com/public#person) Published 10 Jul 2026 · Updated 10 Jul 2026 · 1 min read

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 ![Laravel Enum Casts, Backed Enums, and Value Semantics in PHP 8.3](https://cdn.msaied.com/408/3534df365ffb2c8f6c430180bfaba8f1.png) 

  On this page +1. [Why Backed Enums Deserve More Than a Column Comment](#why-backed-enums-deserve-more-than-a-column-comment)
2. [Defining a Backed Enum with Domain Semantics](#defining-a-backed-enum-with-domain-semantics)
3. [Eloquent Cast: One Line, Full Type Safety](#eloquent-cast-one-line-full-type-safety)
4. [PHP 8.3 Readonly Properties and Enums](#php-83-readonly-properties-and-enums)
5. [Validation: Enum Rule](#validation-enum-rule)
6. [API Resources: Serialize Intentionally](#api-resources-serialize-intentionally)
7. [Querying by Enum Value](#querying-by-enum-value)
8. [Transition Guards on the Enum](#transition-guards-on-the-enum)
9. [Takeaways](#takeaways)

 Why Backed Enums Deserve More Than a Column Comment
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Before PHP 8.1 enums, teams used string constants, `defined()` checks, or custom value-object classes to represent finite domain states. Laravel's native `$casts` support for backed enums removes almost all of that boilerplate — but only if you wire it up correctly across the full request lifecycle: database, validation, and serialization.

This article focuses on the practical gaps that trip up even experienced engineers.

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Defining a Backed Enum with Domain Semantics
--------------------------------------------

```php