PayPal\Common\PPModel::_convertToArray PHP Method

    private function _convertToArray($param)
    {
        $ret = array();
        foreach ($param as $k => $v) {
            if ($v instanceof PPModel) {
                $ret[$k] = $v->toArray();
            } else {
                if (is_array($v)) {
                    $ret[$k] = $this->_convertToArray($v);
                } else {
                    $ret[$k] = $v;
                }
            }
        }
        return $ret;
    }