RFC Tracker

Prevents instantiating and cloning the internal __PHP_Incomplete_Class.

Adds a readonly modifier for local variables, so reassigning one after its first assignment throws an error.

Adds optional crc-fast support to ext/hash for SIMD-accelerated CRC-32 and CRC-64, plus the CRC-64/NVME checksum AWS S3 uses.

Adds an immutable Uri\QueryParams class to parse, change and build query strings outside of $_GET, including RFC 3986 query strings.

Lets a parenthesized boolean expression end with a trailing &&, ||, and or or, the same way trailing commas already work.

Lets a pipe chain end in return, so "Hello World" |> strlen(...) |> return; returns the result reading left to right.

Deprecates lossy casts like (int) "123abc" ahead of a TypeError in PHP 9, and lets strict mode accept Stringable for string parameters.

Lets partial function application fill in the object with this: ?, so DateTimeImmutable::format(this: ?, "c") works with array_map().

Adds a native values() method to backed enums that returns every backing value in declaration order, unless the enum defines its own.

Adds private(namespace) visibility for methods and properties, so classes in the same namespace can share internals without making them public.

Adds (?type) casts that let null pass through and (!type) casts that reject null, both throwing on malformed input like "123abc".

Adds a using keyword and a ContextManager interface, borrowed from Python, that guarantee setup and cleanup around a block of code.

Adds a #[NoSerialize] attribute that leaves a property out of serialize(), or forbids serializing a whole class.

Adds an Encoding namespace with full RFC 4648 Base16, Base32 and Base64 support, plus Base58 and Base85.

Adds num_available_processors(), which returns the number of logical CPUs so you don't have to shell out to nproc.