PHP8で導入されたコンストラクタプロパティプロモーションについて【ウェブデザイン技能検定 1級学科範囲】

class Point {
    private int $x;
    private int $y;

    public function __construct(int $x = 0, int $y = 0) {
        $this->x = $x;
        $this->y = $y;
    }
}

class Point {
    public function __construct(
        private int $x = 0,
        private int $y = 0,
    ) {}
}

class User {
    public function __construct(
        private string $name,
        private int $age,
        private string $email,
        private string $address
    ) {}
}

class Config {
    public function __construct(
        private string $host,
        private string $username,
        private string $password,
        private string $dbname
    ) {}
}

$config = new Config('localhost', 'admin', 'secret', 'test_db');

class UserProfile {
    public function __construct(
        private string $firstName,
        private string $lastName,
        private string $email,
        private int $age,
        private string $gender
    ) {}
}

$userProfile = new UserProfile('John', 'Doe', 'john.doe@example.com', 30, 'male');

class Point {
    public function __construct(
        private int $x = 0,
        private int $y = 0
    ) {}
}

$point = new Point(); // デフォルト値を使用
$customPoint = new Point(10, 20); // カスタム値を使用

class Product {
    public function __construct(
        private string $name,
        private float $price
    ) {}
}