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Immutable DTOs in PHP 8.x let you enforce read‑only state with a few lines of code. Learn how readonly properties, constructor promotion, and shallow immutability work together to keep data safe across your application.
Learn how readonly properties in PHP 8.2 enforce immutability, reduce boilerplate, and what trade‑offs to consider before adopting them.
Combining PHP 8.1 readonly properties with constructor promotion gives you immutable, typed public fields in a single line — ideal for value objects, but watch out for serialization, inheritance, and deep‑immutability limits.