PHP 8.1 in 8 code blocks

Written on 2021-11-07 

enum Status
{
    case draft;
    case published;
    case archived;
    
    public function color(): string
    {
        return match($this) 
        {
            Status::draft => 'grey',   
            Status::published => 'green',   
            Status::archived => 'red',   
        };
    }
}
Enums 
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,
    ) {}
}
Readonly properties 
class PostStateMachine
{
    public function __construct(
        private State $state = new Draft(),
    ) {
    }
}
New in initializers 
$fiber = new Fiber(function (): void {
    $valueAfterResuming = Fiber::suspend('after suspending');
    
    
});
 
$valueAfterSuspending = $fiber->start();
 
$fiber->resume('after resuming');
Fibers, a.k.a. "green threads"

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$array1 = ["a" => 1];

$array2 = ["b" => 2];

$array = ["a" => 0, ...$array1, ...$array2];

var_dump($array);
Array unpacking also supports string keys 
function foo(int $a, int $b) {  }

$foo = foo(...);

$foo(a: 1, b: 2);
First class callables 
function generateSlug(HasTitle&HasId $post) {
    return strtolower($post->getTitle()) . $post->getId();
}
Pure intersection types 
$list = ["a", "b", "c"];

array_is_list($list); 

$notAList = [1 => "a", 2 => "b", 3 => "c"];

array_is_list($notAList); 

$alsoNotAList = ["a" => "a", "b" => "b", "c" => "c"];

array_is_list($alsoNotAList);
The new array_is_list function

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