使用Php从对象获取字段

class Person {
    public $name;
    public $age;
}

$person = new Person();
$person->name = "John";
$person->age = 25;

$name = $person->name;
$age = $person->age;

echo $name; // 输出：John
echo $age; // 输出：25

class Person {
    private $name;
    private $age;

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

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

$person = new Person();
$person->setName("John");
$person->setAge(25);

$name = $person->getName();
$age = $person->getAge();

echo $name; // 输出：John
echo $age; // 输出：25

if (isset($person->name)) {
    $name = $person->name;
    echo $name;
} else {
    echo "属性不存在";
}