“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！
enum Status
{
case draft;
case published;
case archived;
public function color(): string
{
return match($this)
{
Status::draft => 'grey',
Status::published => 'green',
Status::archived => 'red',
};
}
}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
