//实现的wxpay钩子方法
public function wxpay($param){
require './addons/wxpay/wxpaypubhelper/wxpaypubhelper.php';
$jsapi = new \jsapi_pub();
//=========步骤1：网页授权获取用户openid============
if (!isset($_get['code']))
{
//触发微信返回code码
$url = $jsapi->createoauthurlforcode(\wxpayconf_pub::js_api_call_url.'/order_id/'.$param['order_id']);
header(location: $url);
}else
{
$order_id = $param['order_id'];
$info = m('order')->where('id='.$order_id)->find();
if(empty($info) || $info['is_pay'] == 1){
dump('该订单不存在或已支付'.$order_id);
exit();
}
$this->assign('info', $info);
$a = $info['money'];
$b = 100;
$c = $a * $b;
//获取code码，以获取openid
$code = $_get['code'];
$jsapi->setcode($code);
$openid = $jsapi->getopenid();
}
//=========步骤2：使用统一支付接口，获取prepay_id============
//使用统一支付接口
$unifiedorder = new \unifiedorder_pub();
$unifiedorder->setparameter(openid,$openid);//商品描述
$unifiedorder->setparameter(body,在线预订);//商品描述
//自定义订单号，此处仅作举例
$timestamp = time();
// $out_trade_no = \wxpayconf_pub::appid.$timestamp;
$out_trade_no = $info['ordersn'];
$unifiedorder->setparameter(out_trade_no, $out_trade_no);//商户订单号
$unifiedorder->setparameter(total_fee, $c);//总金额
$unifiedorder->setparameter(notify_url,\wxpayconf_pub::notify_url.'/order_id/'.$param['order_id']);//通知地址
$unifiedorder->setparameter(trade_type,jsapi);//交易类型
$prepay_id = $unifiedorder->getprepayid();
//=========步骤3：使用jsapi调起支付============
$jsapi->setprepayid($prepay_id);
$jsapiparameters = $jsapi->getparameters();
$this->assign('jsapiparameters', $jsapiparameters);
$this->display('pay');
}