Demonstration

New Key Features

• Named arguments RFC
• Attributes RFC
• Constructor property promotion RFC
• Union types RFC
• Match expression RFC
• Nullsafe operator RFC
• Saner string to number comparisons RFC
• Consistent type errors for internal functions RFC

Other Notes

Type system and error handling improvements

• Stricter type checks for arithmetic/bitwise operators RFC
• Abstract trait method validation RFC
• Correct signatures of magic methods RFC
• Reclassified engine warnings RFC
• Fatal error for incompatible method signatures RFC
• The @ operator no longer silences fatal errors.
• Inheritance with private methods RFC
• Mixed type RFC
• Static return type RFC
• Types for internal functions Email thread
• Opaque objects instead of resources for Curl, Gd, Sockets, OpenSSL, XMLWriter, and XML extensions

Other syntax tweaks and improvements

• Allow a trailing comma in parameter lists RFC and closure use lists RFC
• Non-capturing catches RFC
• Variable Syntax Tweaks RFC
• Treat namespaced names as single token RFC
• Throw is now an expression RFC
• Allow ::class on objects RFC

New Classes, Interfaces, and Functions

• Weak Map class
• Stringable interface
• str_contains(), str_starts_with(), str_ends_with()
• fdiv()
• get_debug_type()
• get_resource_id()
• token_get_all() object implementation

Sources:

• Sticher.io
• PHP 8.0 Official