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@ 2023-12-02T15:43:27Z

<?php

readonly class ValidAge {
    private const MINIMUM_AGE = 10;
    private function __construct(public int $age) {}
    
    public static function createFromInt(int $age): self|NotValidAge {
        if (self::MINIMUM_AGE >= $age) {
            return new NotValidAge($age, 'Too old');
        }
        
        return new self($age);
    }
}

readonly class NotValidAge {
    public function __construct(
        public int $age,
        public string $error
    ) {}
}



class ValidateAge {
    public function __invoke(int $age): ValidAge|NotValidAge {    
        return ValidAge::createFromInt($age);
    }
}

class User {
    public function __construct(
        public int $id,
        public ValidAge $age
    ) {}
}

$rawAge = 33;
$age = (new ValidateAge)($rawAge);
$user = new User(1, $age);

var_dump($user);

$wrongAge = 8;
$notValidAge = (new ValidateAge)($wrongAge);
$anotherUser = new User(1, $notValidAge);

var_dump($anotherUser);

Output for git.master_jit, git.master: object(User)#1 (2) { ["id"]=> int(1) ["age"]=> object(ValidAge)#2 (1) { ["age"]=> int(33) } } Fatal error: Uncaught TypeError: User::__construct(): Argument #2 ($age) must be of type ValidAge, NotValidAge given, called in /in/WksJS on line 46 and defined in /in/WksJS:32 Stack trace: #0 /in/WksJS(46): User->__construct(1, Object(NotValidAge)) #1 {main} thrown in /in/WksJS on line 32
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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