PHP 8.3 Changelog

Last Updated: September 4, 2025

PHP 8.3 introduces significant enhancements to type safety, performance, and modern language features. This release focuses on improving developer productivity while maintaining backward compatibility and performance improvements for production environments.

PHP 8.3 – September 2025

Added: Readonly type-array syntax (readonly array) to enforce array immutability.

Improved: Enhanced support for nested intersection types in union type declarations.

Added: First-class ARMv9 architecture optimizations for improved performance on modern hardware.

Deprecated: Legacy MySQL mysqlnd driver moved to maintenance mode.

Performance: Optimized JIT compiler and array operations reduce memory overhead for large datasets.

Previous Major Versions

Version	Release Date	Notable Features
PHP 8.2	November 2024	Constructor property promotion for traits, static return type declarations	Details →
PHP 8.1	November 2023	Enumerations, readonly classes, enhanced type declarations	Details →

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