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Learn how readonly properties in PHP 8.2 enforce immutability, reduce boilerplate, and what trade‑offs to consider before adopting them.
When designing a class hierarchy in PHP 8.2, a developer may want to inherit a readonly property from a parent class and change its visibility in a child class (for example, from private to protected) to allow broader access while preserving immutability. Currently, attempting to redeclare an inherited readonly property with a different visibility triggers a
PHP 8.2 deprecates the creation of dynamic properties unless the class is explicitly marked with the #[AllowDynamicProperties] attribute. This change aims to prevent accidental public access and state mutation caused by typos or undeclared class members. When transitioning a codebase from PHP 7.x or 8.0 to 8.2, developers must decide between declaring proper
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