PHP 8.4 continues the language's evolution toward safer, more expressive code. Whether you maintain legacy apps or greenfield Laravel projects, these features are worth adopting early.
Property Hooks
Property hooks let you define get and set logic directly on properties, reducing boilerplate getter/setter methods while keeping encapsulation clear.
Asymmetric Visibility
You can now expose a property as public for reading but restrict writes to protected or private — ideal for immutable DTOs and value objects.
New Array Helpers
Functions like array_find(), array_find_key(), and array_any() replace verbose foreach loops with readable one-liners.
Improved Performance & Deprecations
JIT and opcache refinements deliver modest gains, while deprecated dynamic properties push teams toward explicit declarations — a win for long-term maintainability.
Migration Tips
- Run PHPStan or Psalm after upgrading to catch visibility and type issues early.
- Enable property hooks incrementally in new models before refactoring legacy classes.
- Test Laravel packages for 8.4 compatibility before production rollout.