Test empty on PHP magic properties

magic.php

<?php

class Foo
{
    public function __get($name)
    {
        return 'foo';
    }
}

class Bar
{
    public function __get($name)
    {
        return 'bar';
    }

    public function __isset($name)
    {
        return true;
    }
}

$foo = new Foo();
$bar = new Bar();

var_dump($foo->foo, empty($foo->foo));
// => foo, true

var_dump($bar->bar, empty($bar->bar));
// => bar, false