微信小程序实现支付功能

小程序支付，没有封装支付代码：直接上一段可用的流程代码吧：
微信小程序支付官网文档有详细的说明，这里我就不再赘述啦：
客户端js:

wx.request({
url:'https://www.xxxx.com/order/store',//改成你自己的链接
header:{
'Content-Type':'application/x-www-form-urlencoded'
},
method:'POST',
success:function(res){
console.log(res.data);
console.log('调起支付');
wx.requestPayment({
'timeStamp': res.data.timeStamp,
'nonceStr': res.data.nonceStr,
'package': res.data.package,
'signType':'MD5',
'paySign': res.data.paySign,
'success':function(res){
console.log('success');
wx.showToast({
title:'支付成功',
icon:'success',
duration:3000
});
},
'fail':function(res){
console.log('fail');
},
'complete':function(res){
console.log('complete');
}
});
},
fail:function(res){
console.log(res.data)
}
});

后端部分：laravel5:<?php

namespace App\Http\Controllers\Api\Order;
use App\Models\Order;
use App\Models\OrderGoods;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Models\Member;
use App\Models\MemberAddress;
use App\Models\Product;
use App\Http\Requests;
use App\Http\Requests\Interfaces\MemberCheck;
use Carbon\Carbon;
class OrderController extends Controller
{
    use MemberCheck;
    public function __construct()
    {
        $config = array(
            'appid'         => env('WECHAT_APPID'),//小程序appid
            'pay_mchid'     => env('WECH_ID'),//商户号
            'pay_apikey' =>env('WECHAT_KEY'),//可在微信商户后台生成支付秘钥
        );
        $this->config = $config;
    }

    /**
     * 生成订单号
     * @author      lxhui<772932587@qq.com>
     * @since 1.0
     * @return array
     */
    private static function trade_no() {
        list($usec, $sec) = explode(" ", microtime());
        $usec = substr(str_replace('0.', '', $usec), 0 ,4);
        $str  = rand(10,99);
        return date("YmdHis").$usec.$str;
    }

    /**
     * order
     * @author      lxhui<772932587@qq.com>
     * @since 1.0
     * @return array
     */
    public function store(Request $request )
    {
        \DB::beginTransaction();
        try{
            if( !$this->checkMember(['openid'=>$request->openid]))
                return response()->json(['code'=>200,'status'=>0,'message'=>'该openid未注册']);

            $config = $this->config;
            $result =json_decode($request->apiParams,true);
            if( !$result['addressInfo'])
                return response()->json(['code'=>200,'status'=>0,'message'=>'收货地址不能为空']);
            if( !$result['orderInfo'])
                return response()->json(['code'=>200,'status'=>0,'message'=>'订单商品不能为空']);

            $address_data = [
                'openid'=>$request->openid,
                'realname'=>$result['addressInfo']['userName'],
                'mobile'=>$result['addressInfo']['telNumber'],
                'province'=>$result['addressInfo']['provinceName'],
                'city'=>$result['addressInfo']['cityName'],
                'area'=>$result['addressInfo']['countyName'],
                'address'=>$result['addressInfo']['detailInfo'],
                'zipcode'=>$result['addressInfo']['postalCode'],
            ];
            $model = MemberAddress::firstOrCreate($address_data);
            $productArray =$result['orderInfo'];
            $products = [];
            $orderProducts = [];
            $productsFee = 0.0; //支付商品总价
            foreach ($productArray as $val) {
                $product = Product::find($val['goodsid']);
                $productsFee += $product->marketprice * $val['total'];
            }
            // 计算价格
            $shippingFee = 10.0;
            $totalFee = $productsFee + $shippingFee;
            // 创建订单
            $ordersn = self::trade_no();
            $order = new Order();
            $order->ordersn = $ordersn;
            $order->openid = $request->openid;
            $order->price = $totalFee;
            $order->goodsprice = $totalFee;
            $order->createtime =time();
            $order->addressid = $model->id;
            $order->storeid = $request->storeid;
            $order->save();
            $orderid = $order->id;

            $order_goods = new OrderGoods();
            foreach ($productArray as $val) {
                $product = Product::find($val['goodsid']);
                $product=['orderid'=>$orderid,'goodsid'=>$val['goodsid'],'price'=>$product->marketprice,'total'=>$val['total'],'openid'=>$request->openid];
                array_push($products, $product);
            }
            /* 生产预订单参数 */
            $openid = $request->openid;
            $body = '商城订单';
            $order_sn = $ordersn;
            $total_fee = $totalFee;

            //统一下单参数构造
            $unifiedorder = array(
                'appid'            => $config['appid'],
                'mch_id'        => $config['pay_mchid'],
                'nonce_str'        => self::getNonceStr(),
                'body'            => $body,
                'out_trade_no'    => $order_sn,
                'total_fee'        => $total_fee * 100,
                'spbill_create_ip'    => $request->getClientIp(),
                'notify_url'    => 'https://'.$_SERVER['HTTP_HOST'].'/Api/Wxpay/notify',// 支付微信回调的url，可自定义,非必须
                'trade_type'    => 'JSAPI',
                'openid'        => $request->openid,//'oIXoL0ZpfG3NdSE8Qa-S1GcEHJGY'//测试openid
            );
            $unifiedorder['sign'] = self::makeSign($unifiedorder);
            //请求数据
            $xmldata = self::array2xml($unifiedorder);
            $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
            $res = self::curl_post_ssl($url, $xmldata);
            if(!$res){
                return response()->json(['code'=>200,'status'=>0,'message'=>'无法连接服务器']);
                //self::return_err("Can't connect the server");
            }
             //file_put_contents是用来查看服务器返回的结果 测试完可以删除了,可以使用laravel自带日志功能
             //file_put_contents('/public/log.txt',$res,FILE_APPEND);
　　　　　　　　\Log::info(json_encode($res));
            $content = self::xml2array($res);
            $result_code= isset($content['result_code']) ? $content['result_code'] : '';
            $return_code = isset($content['return_code']) ? $content['return_code'] : '';
            if(strval($result_code) == 'FAIL'){
                return self::return_err(strval($content['err_code_des']));
            }
            if(strval($return_code) == 'FAIL'){
                return self::return_err(strval($content['return_msg']));
            }
            $data = $this->pay($content['prepay_id']);
            \DB::table("eshop_order_goods")->insert($products);
            \DB::commit();
            return response()->json(['code'=>200,'status'=>1,'message'=>'提交成功','data'=>$data]);
        } catch (\Exception $e){
            \DB::rollback();//事务回滚
            return response()->json(['code'=>200,'status'=>0,'message'=>$e->getMessage()]);
        }
    }

    /**
     * 进行支付接口签名
     * @param string $prepay_id 预支付ID(调用prepay()方法之后的返回数据中获取)
     * @return  json的数据
     */
    public function pay($prepay_id){
        $config = $this->config;
        $data = array(
            'appId'        => $config['appid'],
            'timeStamp'    => time(),
            'nonceStr'    => self::getNonceStr(),
            'package'    => 'prepay_id='.$prepay_id,
            'signType'    => 'MD5'
        );

        $data['paySign'] = self::makeSign($data);

        return $data;
    }

    //微信支付回调验证
    public function notify(){
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];

        // 这句file_put_contents是用来查看服务器返回的XML数据 测试完可以删除了
        //file_put_contents(APP_ROOT.'/Statics/log2.txt',$res,FILE_APPEND);

        //将服务器返回的XML数据转化为数组
        $data = self::xml2array($xml);
        // 保存微信服务器返回的签名sign
        $data_sign = $data['sign'];
        // sign不参与签名算法
        unset($data['sign']);
        $sign = self::makeSign($data);

        // 判断签名是否正确  判断支付状态
        if ( ($sign===$data_sign) && ($data['return_code']=='SUCCESS') && ($data['result_code']=='SUCCESS') ) {
            $result = $data;
            //获取服务器返回的数据
            $order_sn = $data['out_trade_no'];            //订单单号
            $openid = $data['openid'];                    //付款人openID
            $total_fee = $data['total_fee'];            //付款金额
            $transaction_id = $data['transaction_id'];     //微信支付流水号

            //更新数据库
            $this->updateDB($order_sn,$openid,$total_fee,$transaction_id);

        }else{
            $result = false;
        }
        // 返回状态给微信服务器
        if ($result) {
            $str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
        }else{
            $str='<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[签名失败]]></return_msg></xml>';
        }
        echo $str;
        return $result;
    }

//---------------------------------------------------------------用到的函数------------------------------------------------------------
    /**
     * 错误返回提示
     * @param string $errMsg 错误信息
     * @param string $status 错误码
     * @return  json的数据
     */
    protected function return_err($errMsg='error',$status=0){
        return response()->json(['code'=>200,'result'=>'fail','status'=>$status,'errmsg'=>$errMsg]);
    }

    /**
     * 正确返回
     * @param     array $data 要返回的数组
     * @return  json的数据
     */
    protected function return_data($data=array()){
        return response()->json(['code'=>200,'result'=>'success','status'=>1,'data'=>$data]);
    }

    /**
     * 将一个数组转换为 XML 结构的字符串
     * @param array $arr 要转换的数组
     * @param int $level 节点层级, 1 为 Root.
     * @return string XML 结构的字符串
     */
    protected function array2xml($arr, $level = 1) {
        $s = $level == 1 ? "<xml>" : '';
        foreach($arr as $tagname => $value) {
            if (is_numeric($tagname)) {
                $tagname = $value['TagName'];
                unset($value['TagName']);
            }
            if(!is_array($value)) {
                $s .= "<{$tagname}>".(!is_numeric($value) ? '<![CDATA[' : '').$value.(!is_numeric($value) ? ']]>' : '')."</{$tagname}>";
            } else {
                $s .= "<{$tagname}>" . $this->array2xml($value, $level + 1)."</{$tagname}>";
            }
        }
        $s = preg_replace("/([\x01-\x08\x0b-\x0c\x0e-\x1f])+/", ' ', $s);
        return $level == 1 ? $s."</xml>" : $s;
    }

    /**
     * 将xml转为array
     * @param  string     $xml xml字符串
     * @return array    转换得到的数组
     */
    protected function xml2array($xml){
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $result= json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $result;
    }

    /**
     *
     * 产生随机字符串，不长于32位
     * @param int $length
     * @return 产生的随机字符串
     */
    protected function getNonceStr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ )  {
            $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }

    /**
     * 生成签名
     * @return 签名
     */
    protected function makeSign($data){
        //获取微信支付秘钥
        $key = $this->config['pay_apikey'];
        // 去空
        $data=array_filter($data);
        //签名步骤一：按字典序排序参数
        ksort($data);
        $string_a=http_build_query($data);
        $string_a=urldecode($string_a);
        //签名步骤二：在string后加入KEY
        //$config=$this->config;
        $string_sign_temp=$string_a."&key=".$key;
        //签名步骤三：MD5加密
        $sign = md5($string_sign_temp);
        // 签名步骤四：所有字符转为大写
        $result=strtoupper($sign);
        return $result;
    }

    /**
     * 微信支付发起请求
     */
    protected function curl_post_ssl($url, $xmldata, $second=30,$aHeader=array()){
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '10.206.30.98');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);

        if( count($aHeader) >= 1 ){
            curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
        }

        curl_setopt($ch,CURLOPT_POST, 1);
        curl_setopt($ch,CURLOPT_POSTFIELDS,$xmldata);
        $data = curl_exec($ch);
        if($data){
            curl_close($ch);
            return $data;
        }
        else {
            $error = curl_errno($ch);
            echo "call faild, errorCode:$error\n";
            curl_close($ch);
            return false;
        }
    }

}

返回结果：

{
    "code": ,
    "status": ,
    "message": "提交成功",
    "data": {
        "appId": "wxaxxxxxxxxxxxxx",
        "timeStamp": ,
        "nonceStr": "qqejagkybrh9rxmyfosze71qs49ppcub",
        "package": "prepay_id=wx2017070815022850d11adcb80558793405",
        "signType": "MD5",
        "paySign": "285BCE1F0B93701D927FA5F6CBE10E86"
    }
}

代码没有完美封装，博友们如果有一套好的封装，请留下共享地址哈啊