yii\base\Model::offsetGet PHP Метод

This method is required by the SPL interface [[\ArrayAccess]]. It is implicitly called when you use something like $value = $model[$offset];.

public offsetGet ( mixed $offset ) : mixed
$offset	mixed	the offset to retrieve element.
Результат	mixed	the element at the offset, null if no element is found at the offset

    public function offsetGet($offset)
    {
        return $this->{$offset};
    }

Model