yii\mongodb\file\Cursor::__isset PHP Метод

PHP magic method, which is invoked on attempt of checking if a property is set.

public __isset ( string $name ) : boolean
$name	string	field name.
Результат	boolean	whether field exists or not.

    public function __isset($name)
    {
        $cursor = $this->getInnerIterator();
        return isset($cursor->{$name});
    }

Cursor