PHP的获取器和修改器：如何优化代码的读取和修改功能

class User {
    private $name;

    public function __get($property) {
        if ($property === 'name') {
            return $this->filterName($this->name);
        }
        // 其他属性的处理
    }

    private function filterName($name) {
        return strtoupper($name);
    }
}

$user = new User();
$user->name = 'John';
echo $user->name; // 输出 'JOHN'

class User {
    private $name;

    public function __set($property, $value) {
        if ($property === 'name') {
            $this->name = $this->sanitizeName($value);
        }
        // 其他属性的处理
    }

    private function sanitizeName($name) {
        return ucfirst($name);
    }
}

$user = new User();
$user->name = 'john';
echo $user->name; // 输出 'John'

class Product {
    private $price;

    public function __get($property) {
        if ($property === 'price') {
            return '$' . max($this->price, 0);
        }
    }

    public function __set($property, $value) {
        if ($property === 'price') {
            $this->price = max($value, 0);
        }
    }
}

$product = new Product();
$product->price = -10;
echo $product->price; // 输出 '$0'