ThinkPHP框架整合微信支付之JSAPI模式图文详解(2)

/**
  * 初始化
  */
 public function _initialize()
 {
  //引入WxPayPubHelper
  vendor('WxPayPubHelper.WxPayPubHelper');
 }

 public function jsApiCall()
 {
  //使用jsapi接口
  $jsApi = new \JsApi_pub();
  
  //=========步骤1：网页授权获取用户openid============
  //通过code获得openid
  if (!isset($_GET['code']))
  {
   //触发微信返回code码
   $url = $jsApi->createOauthUrlForCode(C('WxPayConf_pub.JS_API_CALL_URL'));
   Header("Location: $url");
  }else
  {
   //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();
  
  //设置统一支付接口参数
  //设置必填参数
  //appid已填,商户无需重复填写
  //mch_id已填,商户无需重复填写
  //noncestr已填,商户无需重复填写
  //spbill_create_ip已填,商户无需重复填写
  //sign已填,商户无需重复填写
  $unifiedOrder->setParameter("openid",$openid);//商品描述
  $unifiedOrder->setParameter("body","贡献一分钱");//商品描述
  //自定义订单号，此处仅作举例
  $timeStamp = time();
  $out_trade_no = C('WxPayConf_pub.APPID').$timeStamp;
  $unifiedOrder->setParameter("out_trade_no",$out_trade_no);//商户订单号
  $unifiedOrder->setParameter("total_fee","1");//总金额
  $unifiedOrder->setParameter("notify_url",C('WxPayConf_pub.NOTIFY_URL'));//通知地址
  $unifiedOrder->setParameter("trade_type","JSAPI");//交易类型
  //非必填参数，商户可根据实际情况选填
  //$unifiedOrder->setParameter("sub_mch_id","XXXX");//子商户号
  //$unifiedOrder->setParameter("device_info","XXXX");//设备号
  //$unifiedOrder->setParameter("attach","XXXX");//附加数据
  //$unifiedOrder->setParameter("time_start","XXXX");//交易起始时间
  //$unifiedOrder->setParameter("time_expire","XXXX");//交易结束时间
  //$unifiedOrder->setParameter("goods_tag","XXXX");//商品标记
  //$unifiedOrder->setParameter("openid","XXXX");//用户标识
  //$unifiedOrder->setParameter("product_id","XXXX");//商品ID
  
  $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');
  //echo $jsApiParameters;
 }