Property hooks in PHP 8.4 simplify the creation of computed properties, eliminating the need for docs and ensuring reliable value processing, saving time. The Asymmetric Visibility feature allows better control over property access, reducing the need for getter methods. The #[Deprecated] attribute simplifies marking deprecated methods, providing clearer indications for users. The new DOM API in PHP 8.4 offers improved HTML5 support, with updated classes for better compatibility. Object-oriented BCMath allows mathematical operations with precision numbers. Additional array functions, PDO driver parsers, and new subclasses enhance PHP functionality. Overall, PHP 8.4 introduces numerous improvements and deprecations for enhanced development practices.
https://www.php.net/releases/8.4/en.php