Laravel 5.4中的“尝试获取非对象的属性”

$name = "John";
echo $name->age; // 尝试获取非对象的属性错误

class User {
    public function getName() {
        return "John";
    }
}

$user = new User();
echo $user->getName()->age; // 尝试获取非对象的属性错误

$name = "John";
if (is_object($name)) {
    echo $name->age;
} else {
    echo "变量不是一个对象";
}

class User {
    public function getName() {
        return (object) ["name" => "John"];
    }
}

$user = new User();
$name = $user->getName();
if (is_object($name)) {
    echo $name->age;
} else {
    echo "返回结果不是一个对象";
}