Michał Marcin Brzuchalski brzuchal

Introduction

Annotation is a form of syntactic metadata that can be added to source code. Annotations can be embeded in and read using reflection mechanism. Annotations known from Java or so called Attributes in C# and can be retained by VM at run-time and read via reflection. Annotations can be placed in classes, methods, properties and functions.

PHP offers only a single form of such metadata - doc-comments. In userland there exists some annotation reader libraries like Doctrine Annotations which is widely used for eg. to express object-relational mapping metadata.

Sealed classes

Introduction

A sealed type is one for which subclassing is restricted according to subclass names specified with the class’s declaration or to restrict to the same subclass namespace.

Sealed type is more like extended form of finality, where it is possible to list all class names allowed to extending from sealed class or permit only same namespace class to extend sealed class.

PHP RFC: Delegates

Declaration

To distinguish between classes and delegates a delegate keyword is used to precede delegate name. For FQN optimisations an additional use delegate clause should be placed in all imports and aliases block.

namespace MyApp;

	FROM alpine:latest as builder

	ENV PHP_INI_DIR /etc/php7
	ENV PHP_VERSION 7.3.0
	ENV PHP_FILENAME php-7.3.0.tar.xz
	ENV PHP_SHA256 7d195cad55af8b288c3919c67023a14ff870a73e3acc2165a6d17a4850a560b5

	RUN build_pkgs="build-base linux-headers pcre-dev gnupg autoconf file g++ gcc libc-dev make pkgconf re2c gnupg" \
	&& runtime_pkgs="ca-certificates openssl zlib curl" \
	&& apk add --update --no-cache --virtual .build-deps ${build_pkgs} \

	string(10) "created_at"
	string(10) "2019-02-05"
	object(Message)#1 (5) {
	["id"]=>
	int(999)
	["title"]=>
	string(12) "Hello World!"
	["message"]=>
	string(23) "Here is your message..."
	["time"]=>

	[package]
	name = MyVendor\MyLibrary
	strict_types = 1
	encoding = UTF-8

	<?php

	data Foo {
	var string $foo; // if not set then uninitialized
	var bool $bar = false;
	}

	$foo = new Foo
	{
	foo: "baz",

	====== PHP RFC: Structs ======
	* Version: 0.9
	* Date: 2020-03-25
	* Author: Michał Brzuchalski <[email protected]>
	* Status: Draft
	* First Published at: http://wiki.php.net/rfc/structs


	Structures as a complex type solution for programmers in functional programming appears in few programming languages but differs in a solution taken there. Some languages like C# have both classes and scructs living aside in harmony.

	<?php
	require 'autoload.php';

	$someObject = new Vendor\Package\SomeClass(); // autoloader tries to load... what exactly??? need to load vendor package.php somehow

	<?php
	namespace {
	class ReflectionClass extends \Php\ReflectionClass {}
	class ReflectionType extends \Php\ReflectionTypeConstraint {}
	class ReflectionNamedType extends \Php\ReflectionClassTypeConstraint {}
	}
	namespace Php {
	abstract class ReflectionType implements Reflector {}
	class ReflectionClass extends ReflectionType {}
	class ReflectionTypeConstraint {}