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<[e-mail]>
 * @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<[e-mail]>
 * @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": 200,
"status": 1,
"message": "提交成功",
"data": {
"appId": "wxaxxxxxxxxxxxxx",
"timeStamp": 1499497335,
"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