“php是世界上最好的语言”，它从未停止前进的步伐！php团队目前已经发布了php 8.1.0 rc 5版，而下一个版本将是第六个也是最后一个候选版本 (rc 6)，将于近期发布。下面就给大家介绍一下在php8.1中会有哪8个重要的新转变，先一睹为快吧！
1、枚举（enums）
enum status{ case draft; case published; case archived; public function color(): string { return match($this) { status::draft => 'grey', status::published => 'green', status::archived => 'red', }; }}
2、只读属性（readonly properties）
class postdata{ public function __construct( public readonly string $title, public readonly string $author, public readonly string $body, public readonly datetimeimmutable $createdat, public readonly poststate $state, ) {}}
3、初始化程序中的新内容（new in initializers）
class poststatemachine{ public function __construct( private state $state = new draft(), ) { }}
4、纤维，又名“绿线”（fibers, a.k.a. "green threads"）
$fiber = new fiber(function (): void { $valueafterresuming = fiber::suspend('after suspending'); // … }); $valueaftersuspending = $fiber->start(); $fiber->resume('after resuming');
5、数组解包也支持字符串键（array unpacking also supports string keys）
$array1 = ["a" => 1];$array2 = ["b" => 2];$array = ["a" => 0, ...$array1, ...$array2];var_dump($array); // ["a" => 1, "b" => 2]
6、一种可调用类（first class callables）
function foo(int $a, int $b) { /* … */ }$foo = foo(...);$foo(a: 1, b: 2);
7、纯交集类型（pure intersection types）
function generateslug(hastitle&hasid $post) { return strtolower($post->gettitle()) . $post->getid();}
8、新array_is_list功能（the new array_is_list function）
$list = ["a", "b", "c"];array_is_list($list); // true$notalist = [1 => "a", 2 => "b", 3 => "c"];array_is_list($notalist); // false$alsonotalist = ["a" => "a", "b" => "b", "c" => "c"];array_is_list($alsonotalist); // false
本文系翻译，原文地址：https://stitcher.io/blog/php-81-in-8-code-blocks