微信支付细节

1.配置

//微信支付配置
"wx_pay_config" => [
    'appId' => '********',
    'mchId' => '**********',
    'key'   => '**********',
    'notify_url' => config('app.notify_url').'wxCallback',
],

2.下单

　　扫码支付

$config = config('dailian.wx_pay_config');
$wPay = new \WxControl($config);
$pay_arr = $wPay->unifiedorder('云顶之弈代练', $order['order_num'], 1??$order['price'], 'NATIVE');
if (isset($pay_arr['err_code']) ||$pay_arr['return_code'] != 'SUCCESS' || $pay_arr['result_code'] != 'SUCCESS') 
    return wx_errorReturn(null, -1201, $pay_arr['err_code_des']);
$pay_str = $pay_arr['code_url'];

　　APP支付

$config = config('dailian.wx_pay_config');
$wPay = new \WxControl($config);
$pay_arr = $wPay->unifiedorder('云顶之弈代练', $order['order_num'], 1??$order['price'], 'APP');
if (isset($pay_arr['err_code']) ||$pay_arr['return_code'] != 'SUCCESS' || $pay_arr['result_code'] != 'SUCCESS') 
    return wx_errorReturn(null, -1201, $pay_arr['err_code_des']);
 $pay_str = $wPay->returnWxPayParams($pay_arr);

　　工具类

class WxControl
{

    public $appId;
    public $mchId;
    public $notify_url;
    public $secret;

    public function __construct($config = []){
        $config || $config =  config('const.wx_pay_config');
        $this->appId = $config['appId'];
        $this->mchId = $config['mchId'];
        $this->key = $config['key'];
        $this->notify_url = $config['notify_url'];
        $this->secret = config('const.wx_app_config')['secret'];
    }

    /**
     * 微信统一下单
     */
    public function unifiedorder($body, $out_trade_no, $total_price, $trade_type = "JSAPI")
    {
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        $qdata = [
            'appid' => $this->appId,
            'mch_id' => $this->mchId,
            'nonce_str' => getNonceStr(),
            'body' => $body,
            'out_trade_no' => $out_trade_no,
            'total_fee' => $total_price,
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],
            'notify_url' => $this->notify_url,
            'trade_type' => $trade_type,
//            'openid' => $openid,
        ];
        //签名步骤一：去除空字符
        $signData = array_filter($qdata);
        //签名步骤二：按字典序排序参数
        ksort($signData);
        $string = toUrlParams($signData);
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $sign = strtoupper($string);
        //添加签名
        $qdata['sign'] = $sign;
        $xml = toXml($qdata);
        //发送请求
        $http = new \HttpClient();
        $result = $http->postXmlCurl($xml, $url);

        return $resultArr = xmlToArray($result);
    }

    //检查回调参数验证签名
    public function checkSign($data){
        $sign = $data['sign'];
        $data['sign']="";
//        $data['sign']="";
        //签名步骤一：去除空字符
        $signData = array_filter($data);
        //签名步骤二：按字典序排序参数
        ksort($signData);
        $string = toUrlParams($signData);
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $signA = strtoupper($string);
        //添加签名
        if($sign == $signA) return true;
        return false;
    }

    /**
     * 返回微信支付的参数
     */
    public function returnWxPayParams($param)
    {
        //根据返回的字段再进行一次签名
        $arr = [
            'appid' => $param['appid'],
            'partnerid' => $param['mch_id'],
            'prepayid' => $param['prepay_id'],
            'package' => 'Sign=WXPay',
            'noncestr' => $param['nonce_str'],
            'timestamp' => time(),
        ];
        ksort($arr);
        $arr = array_filter($arr);
        $str = "";
        foreach ($arr as $k=>$v){
            if($str) $str .= "&";
            $str.="{$k}={$v}";
        }
        $str.="&key=".$this->key;
        $sign = strtoupper(md5($str));
        $arr['sign'] = $sign;
        return $arr;
    }

3.前端调起支付

4.回调

　　回调里面要验证签名参数和金额是否与商户所保存的金额数据相等

　　　　 $str = file_get_contents('php://input');
        $data = simplexml_load_string($str, 'SimpleXMLElement', LIBXML_NOCDATA);
        $data = json_decode(json_encode($data), true);

        $config = config('const.wx_pay_config');
        //验证商户号
        if($config['mchId']!=$data['mch_id']) {
            Log::error('商户号不对');exit;
        }
        //验签
        $wx = new \WxControl($config);
        $flage = $wx->checkSign($data);
        if($flage) {
　　　　　　　 $status = $data['return_code'] == 'SUCCESS' || $data['code'] = 10000;
　　　　　　　 if($status){
         　　　　 $order = Db::name('order')->where('order_num', $order_num)->where('status',0)->find();
　　　　  　　　　 if($order['price']*100 != $money){
                    Log::error('金额不对');//exit;
         　　　　 }
　　　　　　　 }
　　　　　}

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