How to use __get() to return null in multilevel object property accessing?

Question

How can I use __get() to return null in multilevel object property accessing the case like this below?

For instance, this is my classes,

class property          


        

Answer 1

Yes, I know it's been 4 years ago, but I had a similar problem this week, and while I trying to solve it, I found this thread. So, here is my solution:

class NoneWrapper
{
    private $data;

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

    public function __get(string $name)
    {
        return property_exists($this->data, $name)
            ? new NoneWrapper($this->data->$name)
            : new None;
    }

    public function __call($name, $arguments)
    {
        if (is_object($this->data)) {
            return (property_exists($this->data, $name))
            ? $this->data->$name
            : null;
        } else {
            return null;
        }
    }

    public function __invoke()
    {
        return $this->data;
    }
}

class None
{
    public function __get(string $name) {
        return new None;
    }

    public function __call($name, $arguments)
    {
        return null;
    }

    public function __invoke()
    {
        return null;      
    }
}

$object = new NoneWrapper(
    json_decode(
        json_encode([
            'foo' => [
                'bar' => [
                    'first' => 1,
                    'second' => 2,
                    'third' => 3,
                    'fourth' => 4,
                ],
            ]
        ])
    )
);

var_dump($object->foo->bar->baz()); // null
var_dump($object->foo->bar->third()); // 3