What key changes have been made in PHP starting from version 8.0?

In PHP 8.0, significant improvements and new features were introduced:

• JIT compilation (Just-In-Time) — improves performance, especially for computational tasks.
• Union Types — allows specifying multiple types for parameters and return values.
• Named Arguments — calling functions with parameter names, enhancing readability.
• Attributes (annotations) — built-in mechanism for adding metadata to classes, methods, and properties.
• Constructor Property Promotion — concise syntax for declaring and initializing properties in the constructor.
• Match Expression — a more powerful and safer alternative to switch.
• Nullsafe Operator (?->) — simplifies working with objects that may be null.

These changes make the code more expressive, safe, and performant.