yii2嵌入微信公众号支付

摘要：微信公众号支付就是微信商城的一种支付方式，微信支付随着微信的推广使用也被广泛应用。微信公众平台的地址是。代码分析我们需要获取到关注微信公众号的人的。回调的方法使用以上就是我的微信支付。

序言

随着微信被越来越多的人使用，微信商城成为如今的热门。每一个商城都需要有自己的支付方式，微信商城也不例外。微信公众号支付就是微信商城的一种支付方式，微信支付随着微信的推广使用也被广泛应用。今天我主要讲的是yii2嵌入微信公众号支付，微信官网的微信支付文档比较简洁，接下来跟着我来看一下yii2如何嵌入微信公众号支付，以及需要注意的事项吧！

前期准备工作

首先必须有一个微信公众号，并且需要在微信公众平台申请微信支付。微信公众平台的地址是：https://mp.weixin.qq.com/cgi-bin/loginpage。申请的过程我这边就不写了，录公众平台以后就可以看到。
其次需要先配置一个域名，必须是80端口,然后在申请完微信支付以后配置上支付授权目录。
准备工作完成以后我们可以开始开发了。

代码分析

1、我们需要获取到关注微信公众号的人的openid。获取openid,我这边是通过网页授权获取用户基本信息接口获取的。其实在github上已经有封装好的关于微信的开发的接口，我们可以直接从上面下载，以后基于yii2的开发微信的其他的功能可以使用。网址是：https://github.com/callmez/yii2-wechat-sdk 大家可以下载然后安装。我的openid的获取也是在此基础上更改的。安装完成以后的目录结构如下图：

我这边使用的是MpWechat.php,在MpWechat.php中我增加了一个方法获取openid。

public function getOpenid($turl)
    {
        if (!isset($_GET["code"])){
            //触发微信返回code码
            
             $url=$this->getOauth2AuthorizeUrl($turl, $this->state, "snsapi_userinfo");
            Header("Location: $url");
            exit();
        } else {
            //获取code码，以获取openid
            $code = $_GET["code"];
            $access_info = $this->getOauth2AccessToken($code);
            return $access_info;
        }
        
    }

$turl是获取到code以后需要跳转的地址。
在控制其中获取openid我是这样写的：

 public function actionView($id)
    {
        
        $openid=isset($_COOKIE["openid"])?$_COOKIE["openid"]:"";
            
            if(empty($openid))
            {
                $t_url=Url::to(["@web/clue/view?id=".$id],true);//这个是获取到code以后需要跳转的url。Url这个是在头部需要增加：use yiihelpersUrl
                $info=$this->wechat->getOpenid($t_url);//注:$this->wechat安装完成yii2-wechat-sdk以后配置以后可以使用
                if($info){
            setcookie("access_token",$info["access_token"],time()+86400*365);
                  setcookie("openid",$info["openid"],time()+86400*365);    
                  
                }
                
            }
        
    }

将获取到的openid放入的cookie中储存。

2、openid获取以后可以进行开发微信支付，我这边将微信支付封装成了一个类，可以配置访问。

第一步、我们可以在common/config/main.php中配置

return [
    "vendorPath" => dirname(dirname(__DIR__)) . "/vendor",
    "language" => "zh-CN", // 启用国际化支持
    "sourceLanguage" => "zh-CN", // 源代码采用中文
    "timeZone" => "Asia/Shanghai", // 设置时区
    "components" => [
        "cache" => [
            "class" => "yiicachingFileCache",
        ],
        "user" => [            
            "identityClass" => "loginmodelsUser",
            "enableAutoLogin" => false,  //开启authTimeout失效
            "identityCookie" => ["name" => "_identity", "httpOnly" => true,"domain" => "." . DOMAIN],
            // "returnUrl"=>"//" . DOMAIN_HOME,
            "authTimeout" => 24*3600*30, // 30 days 
        ],        

        "session" => [
            "timeout" => 24*3600*30, // 30 days
            "useCookies" => true,
            "cookieParams" => [
                "domain" => "." . DOMAIN,
                "lifetime" => 24*3600*30,
            ],
        ],
        //这个是支付的
        "payment" => [
            "class"=>"commonwidgetspaymentInstance",
                
                "weixinjspi_config" => [
                    "code"      => 2,
                    "appid"     => "wx88ee3ca8c06be5c6",//微信的appid
                    "secret"    => "48180f87c2693d50b29d822d019999",//appsecret，在申请完公众号以后可以看到
                    "mch_id"    => "13260614455",//商户号
                    "key"       => "16ceshi",//key需要设置
                    "cert_path" => "",//可以不用填写
                    "key_path"  => "",//可以不用填写
                ],
               
        ],
    ],

我上面的appid、key等都是错误信息需要你们根据自己申请的微信支付进行填写
第二步、在commonwidgets中加入payment文件夹，在文件夹中增加Instance.php

weixin_config = $config;
    }
    public function setWeixins_config($config)
    {
        $this->weixins_config = $config;
    }
    public function setWeixinjspi_config($config)
    {
        $this->weixinjspi_config = $config;
    }
    public function setAlipay_config($config)
    {
        $this->alipay_config = $config;
    }
    public function setBalance_config($config)
    {
        $this->balance_config = $config;
    }

    /**
     * 组合使用余额支付和其他支付
     * @param $order
     * @param $payment
     * @param $balance
     */
    public function unionPay($order,$payment,$balance,$notify)
    {
        $res = [];
        $total_fee = $order["total_fee"];
        if($balance > 0)
        {
            $pay = $this->getBalance();
            if($balance >= $total_fee)
            {
                $res["balance"] = $pay->pay($order);
                return $res;
            }
            else
            {
                $order["total_fee"] = $balance;
                $res["balance"] = $pay->pay($order);
                $total_fee -= $balance;
            }
        }
        $order["total_fee"] = $total_fee;
        $pay = $this->$payment;
        $pay->setNotifyUrl($notify);
        $res[$payment] = $pay->prepay($order);
        //$res[$payment]["balance"] = $balance;
        return $res;
    }

    /**
     * 获得支付宝支付
     * @param null $notify_url
     * @return mixed|object
     */
    public function getAlipay($notify_url = null)
    {
        $this->alipay_config = array_merge(["class"=>Alipay::className()],$this->alipay_config);
        //"var_dump($this->alipay_config);exit;
        return $this->_getPayment("_alipay",$notify_url);
    }

    /**
     * 获得微信app c端支付
     * @param null $notify_url
     * @return mixed|object
     */
    public function getWeixin($notify_url = null)
    {
        $this->weixin_config = array_merge(["class"=>Weixin::className()],$this->weixin_config);
        return $this->_getPayment("_weixin",$notify_url);
    }
    /**
     * 获得手机微信端支付
     * @param null $notify_url
     * @return mixed|object
     */
    public function getWeixinjspi($notify_url = null)
    {
        $this->weixinjspi_config = array_merge(["class"=>Weixinjspi::className()],$this->weixinjspi_config);
        return $this->_getPayment("_weixinjspi",$notify_url);
    }

    /**
     * 获得微信app s端支付
     * @param null $notify_url
     * @return mixed|object
     */
    public function getWeixins($notify_url = null)
    {
        $this->weixins_config = array_merge(["class"=>Weixin::className()],$this->weixins_config);
        return $this->_getPayment("_weixins",$notify_url);
    }

    /**
     * 获得余额支付
     * @return mixed|object
     */
    public function getBalance()
    {
        $this->balance_config = array_merge(["class"=>Balance::className()],$this->balance_config);
        return $this->_getPayment("_balance",null);
    }

    /**
     * @param $name
     * @param $notify_url
     * @return mixed|object
     * @throws yiiaseInvalidConfigException
     */
    private function _getPayment($name, $notify_url)
    {
        $config = substr($name."_config",1);
        if(is_null($this->{$name}))
        {
            $this->{$name} = Yii::createObject($this->{$config});
        }
        if(!is_null($notify_url))
        {
            $this->{$name}->setNotifyUrl($notify_url);
        }
        return $this->{$name};
    }
}

这个类其实是结合了其他的支付方式，其中现在最主要的是getWeixinjspi($notify_url = null)这个方法。
除了这个还需要增加Weixinjspi.php

appid = $appid;
    }

    public function setKey($key)
    {
        $this->key = $key;
    }

    public function setSecret($secret)
    {
        $this->secret = $secret;
    }

    public function setKey_path($key_path)
    {
        $this->key_path = Yii::getAlias($key_path);
    }
    public function setCert_path($cert_path)
    {
        $this->cert_path = Yii::getAlias($cert_path);
    }

    public function setMch_id($mch_id)
    {
        $this->mch_id = $mch_id;
    }

    public function init()
    {
        parent::init();
        $needs = array("appid","mch_id","key","secret");
        foreach($needs as $need)
        {
            if(empty($this->{$need}))
            {
                throw new InvalidConfigException(get_class($this) . " must define weixin"s params {$need}.");
            }
        }
    }

    private function _checkRefund()
    {
        $needs = array("key_path","cert_path");
        foreach($needs as $need)
        {
            if(empty($this->{$need}))
            {
                throw new InvalidConfigException(get_class($this) . " must define weixin"s params {$need}.");
            }
        }
    }

    /**
     * jsapi支付接口
     * @param $order
     * @return mixed
     */
    public function pay($order)
    {
        $paras = [
            "body"              =>$order["goods_desc"],//设置商品或支付单简要描述
            "attach"            =>"PC",//设置附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据
            "out_trade_no"      =>$this->order_pre.$order["order_sn"],//订单号
            "total_fee"         =>(int)($order["total_fee"] * 100),//订单总金额
            "detail"            =>$order["body"],
            "time_start"        =>empty($order["time_start"])? "":$order["time_start"],
            "time_expire"       =>empty($order["time_expire"])? "":$order["time_expire"],
            "goods_tag"         =>empty($order["goods_tag"])? "":$order["goods_tag"],//设置商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠
            "notify_url"        =>empty($order["notify_url"])? "":$this->setNotifyUrl($order["notify_url"]),//回调地址
            "trade_type"        =>"JSAPI",
            "product_id"        =>empty($order["order_sn"])? "":$order["order_sn"],
            "openid"            =>empty($order["openid"])? "":$order["openid"],
            "nonce_str"         =>$this->randomStr(),
           
        ];
        ///var_dump($paras);exit;
        $timeout = empty($order["timeout"])? 6 :$order["timeout"];
        if($order["total_fee"] <= 0)
        {
            throw new InvalidValueException(get_class($this) . " 支付金额必须大于0");
        }
        $trade = $this->createOrder($paras,$timeout);
        
         if(isset($trade["return_code"]) && $trade["return_code"] == "SUCCESS")
        {
            if(isset($trade["result_code"]) && $trade["result_code"] == "SUCCESS")
            {
                
                $data=[
                    "appId"    =>$trade["appid"],
                    "timeStamp"=>"".time()."",
                    "nonceStr" =>$this->randomStr(),
                    "signType"=>"MD5",
                    "package"  =>"prepay_id=".$trade["prepay_id"],    
                ];
                $data["paySign"]=$this->sign($data);
                //$data["signature"]=$order["signature"];
                $parameters = json_encode($data);
               return $parameters;//二维码的信息
            }
            else
            {
                
                return false;
            }
        }
        else
        {
            return false;
        }
    }
 
    public function getJs($parameters,$order_sn)
    {
        
        $str="
        ";
        return $str;
    }
    /**
     * 预支付接口，在APP上发起支付
     * @param $order
     * @return mixed
     */
    public function prepay($order)
    {
        $needs = array("title","order_sn","body","total_fee");
        foreach($needs as $need)
        {
            if(!isset($order[$need]))
            {
                throw new InvalidConfigException(get_class($this) . " $order 中必须包含键 {$need}.");
            }
        }
        $paras = [
            "trade_type"        =>"APP",
            "time_start"        =>empty($order["time_start"])? "":$order["time_start"],
            "time_expire"       =>empty($order["time_expire"])? "":$order["time_expire"],
            "goods_tag"         =>empty($order["goods_tag"])? "":$order["goods_tag"],
            "device_info"       =>empty($order["device_info"])? "":$order["device_info"],
            "out_trade_no"      =>$this->order_pre.$order["order_sn"],
            "detail"            =>$order["body"],
            "total_fee"         =>(int)($order["total_fee"] * 100),
            "body"              =>$order["title"],
            "fee_type"          =>empty($order["fee_type"])? "":$order["fee_type"],
            "product_id"        =>empty($order["product_id"])? "":$order["product_id"],
            "openid"            =>empty($order["openid"])? "":$order["openid"],
            "attach"            =>empty($order["attach"])? "":$order["attach"],
            "notify_url"        =>empty($order["notify_url"])? "":$this->setNotifyUrl($order["notify_url"]),//回调地址
        ];
        $timeout = empty($order["timeout"])? 6 :$order["timeout"];
        if($order["total_fee"] <= 0)
        {
            throw new InvalidValueException(get_class($this) . " 支付金额必须大于0");
        }
        $trade = $this->createOrder($paras,$timeout);
        if(isset($trade["return_code"]) && $trade["return_code"] == "SUCCESS")
        {
            if(isset($trade["result_code"]) && $trade["result_code"] == "SUCCESS")
            {
                $trade["total_fee"] = $order["total_fee"];
                return $this->getSign($trade);
            }
            else
            {
                throw new InvalidValueException(get_class($this) . $trade["err_code_des"]);
            }
        }
        else
        {
            throw new InvalidValueException(get_class($this) . $trade["return_msg"]);
        }
    }

    public function getSign($order)
    {
        $total_fee = $order["total_fee"];
        $keys = ["appid","partnerid","prepayid","package","noncestr","timestamp","sign"];
        $order["partnerid"] = $order["mch_id"];
        $order["prepayid"] = $order["prepay_id"];
        $order = array_intersect_key($order,array_fill_keys($keys,""));
        $order["package"] = "Sign=WXPay";
        $order["timestamp"] = time();
        $order["noncestr"] = $this->randomStr(30);
        $order["sign"] = $this->sign($order);
        $order["total_fee"] = $total_fee;
        return $order;
    }

    public function notify()
    {
        //获取通知的数据
        $xml = $GLOBALS["HTTP_RAW_POST_DATA"];
        //如果返回成功则验证签名
        //try {
            $result = $this->fromXml($xml);
            if($result["return_code"] == "SUCCESS")
            {
                $sign = $this->sign($result);
                if($sign == $result["sign"])
                {
                    $result["trade_no"]=$result["transaction_id"];
                    $result["out_trade_no"]=substr($result["out_trade_no"],strlen($this->order_pre));
                    $result["trade_status"]="TRADE_SUCCESS";
                    return $result;
                }
                else
                {
                    return false;
                }
            }
            else
            {
               return false;
            }
       // } catch (Exception $e){
       //     throw new InvalidValueException(get_class($this) . $e->errorMessage());
       // }
    }

    /**
     * 退款接口
     * @param $order
     * @return mixed
     */
    public function refund($order)
    {
        $this->_checkRefund();
        $needs = array("order_sn","total_fee");
        foreach($needs as $need)
        {
            if(!isset($order[$need]))
            {
                throw new InvalidConfigException(get_class($this) . " $order 中必须包含键 {$need}.");
            }
        }
        $order["out_trade_no"] = $this->order_pre.$order["order_sn"];
        $order["total_fee"] = round($order["total_fee"],2) * 100;
        $order["refund_fee"] = $order["total_fee"];
        $order["op_user_id"] = $this->mch_id;

        $need = array("out_trade_no","out_refund_no","total_fee","refund_fee","op_user_id");
        $keys = ["device_info","refund_fee_type","transaction_id"];
        foreach($need as $key)
        {
            if(empty($order[$key])) {
                throw new InvalidConfigException("缺少退款申请接口必填参数{$key}！");
            }
        }

        $order = array_intersect_key($order,array_fill_keys(array_merge($need, $keys),""));
        $order["appid"] = $this->appid;
        $order["mch_id"] = $this->mch_id;
        $order["nonce_str"] = $this->randomStr();
        $order["sign"] = $this->sign($order);
        $xml = $this->toXml($order);
        $response = $this->postXmlCurl($xml, $this->refund_url);
        $result = $this->convertResponse($response);

        return $result;
    }

    /**
     * Notify处理完成接口
     * @return mixed
     */
    public function finish()
    {
        $arr = ["return_code"=>"SUCCESS"];
        $xml = $this->toXml($arr);
        return $xml;
    }

    /**
     * 设置Notify回调接口
     * @return mixed
     */
    public function setNotifyUrl($url)
    {
        $this->notify_url = $url;
    }

    /**
     * 获得Notify返回的支付金额
     * @return mixed
     */
    public function getTotalFee($total_fee = null)
    {
        if($total_fee)
        {
            return round($total_fee/100,2,PHP_ROUND_HALF_DOWN);
        }
        if(isset($this->notify_data["total_fee"]))
        {
            return round($this->notify_data["total_fee"]/100,2,PHP_ROUND_HALF_DOWN);
        }
        return false;
    }

    /**
     * 获得Notify返回的交易号
     * @return mixed
     */
    public function getSerialNo($arr = null)
    {
        if(isset($arr["transaction_id"]))
        {
            return $arr["transaction_id"];
        }
        if(isset($this->notify_data["transaction_id"]))
        {
            return $this->notify_data["transaction_id"];
        }
        return false;
    }

    /**
     * 获得Notify返回的原始数据
     * @return mixed
     */
    public function getNotifyRaw()
    {
        return $GLOBALS["HTTP_RAW_POST_DATA"];
    }

    public function randomStr($length = 32)
    {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        $str ="";
        for ( $i = 0; $i < $length; $i++ )  {
            $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }

    public function getIp()
    {
        if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
            $arr = explode(",", $_SERVER["HTTP_X_FORWARDED_FOR"]);
            $strIp = $arr[0];
        } elseif (isset($_SERVER["HTTP_CLIENT_IP"])) {
            $strIp = $_SERVER["HTTP_CLIENT_IP"];
        } elseif (isset($_SERVER["REMOTE_ADDR"])) {
            $strIp = $_SERVER["REMOTE_ADDR"];
        } else {
            $strIp = "0.0.0.0";
        }
        return $strIp;
    }

    private function toXml($values)
    {
        if(!is_array($values) || count($values) <= 0)
        {
            throw new InvalidValueException("数组数据异常！");
        }
        //var_dump($values);exit;
        $xml = "";
        foreach ($values as $key=>$val)
        {
            if (is_numeric($val)){
                $xml.="<".$key.">".$val."";
            }else{
                $xml.="<".$key.">";
                
            }
        }
        $xml.="";
        //echo $xml;exit;
        return $xml;
    }

    private function fromXml($xml)
    {
        if(!$xml){
            throw new InvalidValueException("xml数据异常！");
        }
        try
        {
            $values = json_decode(json_encode(simplexml_load_string($xml, "SimpleXMLElement", LIBXML_NOCDATA)), true);
        }
        catch(Exception $e)
        {
            throw new InvalidValueException("xml数据异常！");
        }
        return $values;
    }

    public function sign($values)
    {
        ksort($values);
        $string = "";
        foreach ($values as $k => $v)
        {
            if($k != "sign" && $v != "" && !is_array($v)){
                $string .= $k . "=" . $v . "&";
            }
        }

        $string = trim($string, "&");
        $string = $string . "&key=".$this->key;
        $string = md5($string);
        return strtoupper($string);
    }

    public function checkSign($values)
    {
        if($this->sign($values) == $values["sign"]){
            return true;
        }
        throw new InvalidValueException("验证签名错误！");
    }

    private function convertResponse($xml)
    {
        $result = $this->fromXml($xml);
        if($result["return_code"] != "SUCCESS")
        {
            throw new InvalidValueException($result["return_msg"]);
        }
        if($this->checkSign($result) === true){
            return $result;
        }else{
            return false;
        }
    }

    public function searchOrder($out_trade_no, $transaction_id = "",$timeOut = 6)
    {
        if(empty($out_trade_no) && empty($transaction_id)) {
            throw new InvalidValueException("缺少订单查询接口必填参数out_trade_no或transaction_id！");
        }
        $order = ["out_trade_no"=>$out_trade_no,"transaction_id"=>$transaction_id];
        $order["appid"] = $this->appid;
        $order["mch_id"] = $this->mch_id;
        $order["nonce_str"] = $this->randomStr();
        $order["sign"] = $this->sign($order);

        $xml = $this->toXml($order);
        $response = $this->postXmlCurl($xml, $this->search_order_url, false, $timeOut);
        $result = $this->convertResponse($response);

        return $result;
    }

    public function closeOrder($out_trade_no, $timeOut = 6)
    {

        if(empty($out_trade_no)) {
            throw new InvalidValueException("缺少订单查询接口必填参数out_trade_no！");
        }
        $order = ["out_trade_no"=>$out_trade_no];
        $order["appid"] = $this->appid;
        $order["mch_id"] = $this->mch_id;
        $order["nonce_str"] = $this->randomStr();
        $order["sign"] = $this->sign($order);

        $xml = $this->toXml($order);
        $response = $this->postXmlCurl($xml, $this->close_order_url, false, $timeOut);
        $result = $this->convertResponse($response);

        return $result;
    }

    public function createOrder(array $order, $timeOut = 6)
    {
        //检测必填参数
        $need = array("out_trade_no","body","total_fee","trade_type");
        $keys = array("appid","mch_id","device_info","nonce_str","sign","detail","attach","fee_type",
            "spbill_create_ip","time_start","time_expire","goods_tag","notify_url","product_id","openid");
        $keys = array_merge($need,$keys);
        foreach($need as $key)
        {
            if(empty($order[$key])) {
                throw new InvalidValueException("缺少统一下单接口必填参数{$key}！");
            }
        }

        //关联参数
        if($order["trade_type"] == "JSAPI" && empty($order["openid"])){
            throw new InvalidValueException("统一支付接口中，缺少必填参数openid！trade_type为JSAPI时，openid为必填参数！");
        }
        if($order["trade_type"] == "NATIVE" && empty($order["product_id"])){
            throw new InvalidValueException("统一支付接口中，缺少必填参数product_id！trade_type为JSAPI时，product_id为必填参数！");
        }

        $order = array_intersect_key($order,array_fill_keys($keys,""));
        $order["appid"] = $this->appid;
        $order["mch_id"] = $this->mch_id;
        $order["notify_url"] = $this->notify_url;
        $order["spbill_create_ip"] = $this->getIp();
        $order["nonce_str"] = $this->randomStr();
        $order["sign"] = $this->sign($order);
        $xml = $this->toXml($order);
    //    var_dump( $order["notify_url"]  );exit;
        $response = $this->postXmlCurl($xml, $this->order_url, false, $timeOut);
        //var_dump($response);exit;
        $result = $this->convertResponse($response);
        return $result;
    }

    public function searchRefund($order, $timeOut = 6)
    {
        $keys = ["out_refund_no","out_trade_no","transaction_id","refund_id"];
        if(empty($order["out_trade_no"]) && empty($order["transaction_id"]) && empty($order["out_refund_no"]) && empty($order["refund_id"])) {
            throw new InvalidValueException("退款查询接口中，out_refund_no、out_trade_no、transaction_id、refund_id四个参数必填一个！");
        }
        $order = array_intersect_key($order,array_fill_keys($keys,""));
        $order["appid"] = $this->appid;
        $order["mch_id"] = $this->mch_id;
        $order["nonce_str"] = $this->randomStr();
        $order["sign"] = $this->sign($order);
        $xml = $this->toXml($order);
        $response = $this->postXmlCurl($xml, $this->search_refund_url, true, $timeOut);
        $result = $this->convertResponse($response);

        return $result;
    }

    private function postXmlCurl($xml, $url, $useCert = false, $second = 30)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);

        //如果有配置代理这里就设置代理
        if($this->curl_proxy_host != "0.0.0.0" && $this->curl_proxy_port != 0){
            curl_setopt($ch,CURLOPT_PROXY, $this->curl_proxy_host);
            curl_setopt($ch,CURLOPT_PROXYPORT, $this->curl_proxy_port);
        }
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

        if($useCert == true && !empty($this->cert_path) && !empty($this->key_path)){
            //设置证书
            //使用证书：cert 与 key 分别属于两个.pem文件
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,"PEM");
            curl_setopt($ch,CURLOPT_SSLCERT, $this->cert_path);
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,"PEM");
            curl_setopt($ch,CURLOPT_SSLKEY, $this->key_path);
        }
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data){
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new InvalidValueException("curl出错，错误码:{$error}");
        }
    }
}

还需要增加一个Notifyurl.php

payment->$funame();
        $result=$respmodel->notify();
        if($result){
            //商户订单号

            $out_trade_no = $result["out_trade_no"];

            //交易号

            $trade_no = $result["trade_no"];

            //交易状态
            $trade_status = $result["trade_status"];


            if ($trade_status == "TRADE_SUCCESS")
            {
                $this->update_status($out_trade_no,$trade_no,1);
                echo "success";
            }else{
                
                 echo "fail";
            }
            
        }else{
            echo "fail";
         
        }
       
       
       
   }
   //支付状态更改
   public  function update_status($out_trade_no,$trade_no,$pay_status)
   {
      
   }
   
}

?>

第三步、我们如何使用呢，
在我们需支付的controller中，
//微信支付

  public function actionWeixinpay()
    {
        
            $openid=isset($_COOKIE["openid"])?$_COOKIE["openid"]:"";
        
           
            if($openid)
            {
                
                  $order_=[
                              "goods_desc"=>"测试",
                              "order_sn" =>"2222",
                              "total_fee" =>12,
                              "body"=>"测试",
                              "time_start" =>date("YmdHis"),
                              "time_expire"=>date("YmdHis", time() + 86400*300),
                              "goods_tag" =>"",
                              "notify_url"=>Url::to(["@web/respond/updatepay"],true),//这是回调地址，微信通知的地址
                              "openid"=>$openid,
                           
                  
                           ];
                  $paymodel=Yii::$app->payment->getWeixinjspi();
        
                   $result=$paymodel->pay($order_);//生成预付单
                 if($result)
                 {
                     $jsstr=$paymodel->getJs($result,$order_["order_sn"]);
                    //根据预付单信息生成js，详细的可以看上面的类的方法。
                
                 }
                  
                
           }
              
                
            
           
        echo $jsstr;
        
        
    }

第四步、在view层我们可以这样写：

我这边是采用的ajax的形式进行支付的，可以根据自己的情况进行调整
第五步、支付最重要的是需要回调,yii2增加了Csrf验证，禁止了外部的访问，我们在控制其中写回调方法的时候必须增加：

public function beforeAction($action) {
        $this->enableCsrfValidation = false;
       return parent::beforeAction($action);
   }

不然微信将访问不到。
回调的方法使用：

 use commonwidgetspaymentWeixinjspi;
use commonwidgetspaymentNotifyurl;
 public function actionUpdatepay()
    {
        $model=new Notifyurl();
        $model->notify("Weixinjspi");
        
    }

以上就是我的微信支付。
第一次写文章，有不完善的地方请多包涵，有不对的地方请指出我这边再完善