从未停止前进，PHP8.1带来了8个重要的新转变！

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我是靠谱客的博主寒冷康乃馨，这篇文章主要介绍从未停止前进，PHP8.1带来了8个重要的新转变！，现在分享给大家，希望可以做个参考。

“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）

复制代码enum Status
{
    case draft;
    case published;
    case archived;
    
    public function color(): string
    {
        return match($this) 
        {
            Status::draft => 'grey',   
            Status::published => 'green',   
            Status::archived => 'red',   
        };
    }
}1
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enum Status
{
    case draft;
    case published;
    case archived;
    
    public function color(): string
    {
        return match($this) 
        {
            Status::draft => 'grey',   
            Status::published => 'green',   
            Status::archived => 'red',   
        };
    }
}
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2、只读属性（Readonly properties）

复制代码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,
    ) {}
}1
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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,
    ) {}
}
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3、初始化程序中的新内容（New in initializers）

复制代码class PostStateMachine
{
    public function __construct(
        private State $state = new Draft(),
    ) {
    }
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class PostStateMachine
{
    public function __construct(
        private State $state = new Draft(),
    ) {
    }
}
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4、纤维，又名“绿线”（Fibers, a.k.a. "green threads"）

复制代码$fiber = new Fiber(function (): void {
    $valueAfterResuming = Fiber::suspend('after suspending');
    
    // … 
});
 
$valueAfterSuspending = $fiber->start();
 
$fiber->resume('after resuming');1
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$fiber = new Fiber(function (): void {
    $valueAfterResuming = Fiber::suspend('after suspending');
    
    // … 
});
 
$valueAfterSuspending = $fiber->start();
 
$fiber->resume('after resuming');
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5、数组解包也支持字符串键（Array unpacking also supports string keys）

复制代码$array1 = ["a" => 1];
$array2 = ["b" => 2];
$array = ["a" => 0, ...$array1, ...$array2];
var_dump($array); // ["a" => 1, "b" => 2]1
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$array1 = ["a" => 1];
$array2 = ["b" => 2];
$array = ["a" => 0, ...$array1, ...$array2];
var_dump($array); // ["a" => 1, "b" => 2]
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6、一种可调用类（First class callables）

复制代码function foo(int $a, int $b) { /* … */ }
$foo = foo(...);
$foo(a: 1, b: 2);1
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function foo(int $a, int $b) { /* … */ }
$foo = foo(...);
$foo(a: 1, b: 2);
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7、纯交集类型（Pure intersection types）

复制代码function generateSlug(HasTitle&HasId $post) {
    return strtolower($post->getTitle()) . $post->getId();
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function generateSlug(HasTitle&HasId $post) {
    return strtolower($post->getTitle()) . $post->getId();
}
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8、新array_is_list功能（The new array_is_list function）

复制代码$list = ["a", "b", "c"];
array_is_list($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); // false1
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$list = ["a", "b", "c"];
array_is_list($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
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