php 属性

class Person {
    private $name;
    private $age;

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

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

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

    public function getAge() {
        return $this->age;
    }

    public function setAge($age) {
        if ($age >= 0) {
            $this->age = $age;
        } else {
            throw new Exception("Age cannot be negative.");
        }
    }
}

$person = new Person("Alice", 30);
echo $person->getName(); // 输出: Alice
$person->setName("Bob");
echo $person->getName(); // 输出: Bob

class Person {
    private $name;

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

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

    public function setName($name) {
        if (!empty($name)) {
            $this->name = $name;
        } else {
            throw new Exception("Name cannot be empty.");
        }
    }
}

$person = new Person("");
// 抛出异常: Name cannot be empty.