PHP对象转字符的常见问题及解决方案

class User {
    private $name;

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

    public function __toString() {
        return $this->name;
    }
}

$user = new User('Alice');
echo (string)$user;

class Product {
    private $name;
    private $price;

    public function __construct($name, $price) {
        $this->name = $name;
        $this->price = $price;
    }

    public function __toString() {
        return "Product: {$this->name}, Price: {$this->price}";
    }
}

$product = new Product('Mobile Phone', 500);
echo (string)$product;

class Car {
    private $brand;
    private $model;

    public function __construct($brand, $model) {
        $this->brand = $brand;
        $this->model = $model;
    }

    public function getModel() {
        return $this->model;
    }

    public function __toString() {
        return "Car: {$this->brand}, Model: {$this->getModel()}";
    }
}

$car = new Car('Toyota', 'Corolla');
echo (string)$car;