//②、统一下单

$input = new \WxPayUnifiedOrder();

$input->SetBody(“商务秘书-”.trim($order_info[‘order_sn’]));

$input->SetAttach(“商务秘书-”.trim($order_info[‘order_sn’]));

$input->SetOut_trade_no($pay_sn);

$input->SetTotal_fee(floatval($order_info[‘amount’])*100);

$input->SetTime_start(date(“YmdHis”));

$input->SetTime_expire(date(“YmdHis”, time() + 3600));

$input->SetGoods_tag(“商务秘书-”.trim($order_info[‘order_sn’]));

$input->SetTrade_type(“JSAPI”);

$input->SetOpenid($openId);

$order = \WxPayApi::unifiedOrder($input);

//echo ‘<font color="#f00"><b>统一下单支付单信息</b></font><br/>’;

//printf_info($order);

$arr= array();

$arr[‘appId’] = $order[‘appid’];

$arr[‘nonceStr’] = $order[‘nonce_str’];

$arr[‘package’] = “prepay_id=”.$order[‘prepay_id’];

$arr[‘signType’] = “MD5”;

$arr[‘timeStamp’] = (string)time();

$str = $this->ToUrlParams($arr);

$jmstr = $str."&key=".\WxPayConfig::KEY;

$arr[‘paySign’] = strtoupper(MD5($jmstr));

echo json_encode(array(‘status’=>1,‘arr’=>$arr));

exit();

运行时，显示 order：undefined，请问这是什么问题