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A JIT-based compiler was introduced to compile PHP code into native machine code.

Supports the definition and use of new data types such as Tuple and Enum.

Several new functions and language features are introduced, including str_contains() function, array_is_list() function, readonly attribute, etc.

Improvements have been made to PHP error handling, including the new @= error control operator, optional binary number separators, clearer error messages, and more.

Through some internal optimizations, such as a new hash algorithm, a new string implementation, optimized reference counting, etc.

PHP 7.4 introduced Typed Properties.

Arrow functions make it easier to define and use anonymous functions.

PHP 7.4 introduced the ability to use the spread operator on arrays.

Null Coalescing Assignment Operator.

Introduced the preload mechanism.

Improved syntax and functionality of type hints.

FFI allows PHP to directly call C language code and external function libraries.

Optimizing compiler and runtime engine.