PHP 8.3: What's New and Changed

New Features

• Typed Class Constants
• Added json_validate function
• Dynamic class constant and Enum member fetch support
• gc_status() returns additional GC information
• Random extension: New \Random\Randomizer::getBytesFromString method
• Random extension: New \Random\Randomizer::getFloat() and nextFloat() methods
• Fallback value support for PHP INI Environment Variable syntax
• PHP CLI Lint (php -l) supports linting multiple files at once
• class_alias() supports aliasing built-in PHP classes
• New stream_context_set_options function

Syntax/Functionality Changes

• unserialize(): Upgrade E_NOTICE errors to E_WARNING
• highlight_file and highlight_string output HTML changes
• Granular DateTime Exceptions
• Class constant type declarations in some PHP extension classes
• Built-in CLI Server $_SERVER['SERVER_SOFTWARE'] value changed for RFC3875 compliance

Deprecations

• get_class() and get_parent_class() function calls without arguments deprecated