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@ 2015-11-02T19:33:38Z

<?php
class ValueObject implements JsonSerializable {
    protected $value;
    public function jsonSerialize() {
        return $this->value;
    }
}
class Email extends ValueObject {
    public function __construct(string $value) {
        $email = filter_var($value, FILTER_VALIDATE_EMAIL);
        if (false === $email) {
            throw new Exception('Email is invalid.');
        }
        $this->value = $email;
    }
}
class Age extends ValueObject {
    public function __construct(int $value) {
        if ($value > 150) {
            throw new Exception('Age must be less than 150.');
        }
        $this->value = $value;
    }
}
class User implements JsonSerializable {
    private $email;
    private $age;
    public function __construct(Email $email) {
        $this->email = $email;
    }
    public function setAge(Age $age) { $this->age = $age; }
    public function jsonSerialize() {
        return (array) $this;
    }
}


$email = new Email('opexus@gmail.com');
$age = new Age(23);
$user = new User($email);
$user->setAge($age);
echo json_encode($user);

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of ValueObject::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/trllL on line 4 Deprecated: Return type of User::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/trllL on line 32 {"\u0000User\u0000email":"opexus@gmail.com","\u0000User\u0000age":23}

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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