რელიზი!

class Status
{
    const DRAFT = 'draft';
    const PUBLISHED = 'published';
    const ARCHIVED = 'archived';
}
function acceptStatus(string $status) {...}

enum Status
{
    case Draft;
    case Published;
    case Archived;
}
function acceptStatus(Status $status) {...}

class BlogData
{
    private Status $status;

    public function __construct(Status $status)
    {
        $this->status = $status;
    }

    public function getStatus(): Status
    {
        return $this->status;
    }
}

class BlogData
{
    public readonly Status $status;

    public function __construct(Status $status)
    {
        $this->status = $status;
    }
}

$foo = [$this, 'foo'];

$fn = Closure::fromCallable('strlen');

$foo = $this->foo(...);

$fn = strlen(...);

class Service
{
    private Logger $logger;

    public function __construct(
        ?Logger $logger = null,
    ) {
        $this->logger = $logger ?? new NullLogger();
    }
}

class Service
{
    private Logger $logger;

    public function __construct(
        Logger $logger = new NullLogger(),
    ) {
        $this->logger = $logger;
    }
}

class User
{
    /**
     * @Assert\All({
     *     @Assert\NotNull,
     *     @Assert\Length(min=5)
     * })
     */
    public string $name = '';
}

class User
{
    #[\Assert\All(
        new \Assert\NotNull,
        new \Assert\Length(min: 5))
    ]
    public string $name = '';
}

function count_and_iterate(Iterator $value) {
    if (!($value instanceof Countable)) {
        throw new TypeError('value must be Countable');
    }

    foreach ($value as $val) {
        echo $val;
    }

    count($value);
}

function count_and_iterate(Iterator&Countable $value) {
    foreach ($value as $val) {
        echo $val;
    }

    count($value);
}

function redirect(string $uri) {
    header('Location: ' . $uri);
    exit();
}

function redirectToLoginPage() {
    redirect('/login');
    echo 'Hello'; // <- dead code
}

function redirect(string $uri): never {
    header('Location: ' . $uri);
    exit();
}

function redirectToLoginPage(): never {
    redirect('/login');
    echo 'Hello'; // <- dead code detected by static analysis
}

class Foo
{
    public const XX = "foo";
}

class Bar extends Foo
{
    public const XX = "bar"; // No error
}

class Foo
{
    final public const XX = "foo";
}

class Bar extends Foo
{
    public const XX = "bar"; // Fatal error
}

016 === 16; // false because `016` is octal for `14` and it's confusing
016 === 14; // true

0o16 === 16; // false — not confusing with explicit notation
0o16 === 14; // true

$httpClient->request('https://example.com/')
        ->then(function (Response $response) {
            return $response->getBody()->buffer();
        })
        ->then(function (string $responseBody) {
            print json_decode($responseBody)['code'];
        });

$response = $httpClient->request('https://example.com/');
print json_decode($response->getBody()->buffer())['code'];