php 对接微信APP支付

以下内容请结合官方文档 

开发前准备:

商户在微信开放平台申请开发应用后，微信开放平台会生成APP的唯一标识APPID。由于需要保证支付安全，需要在开放平台绑定商户应用包名和应用签名，设置好后才能正常发起支付。设置界面在【开放平台】中的栏目【管理中心 / 修改应用 / 修改开发信息】里面，如图所示

应用签名和应用包名如何写,如果你是用apicloud开发的,前端会知道的,具体可参考官方文档;下面我们就可以开始开发了

支付流程: 1.先调用统一下单API生成预付订单

                 2.获取到prepay_id后将参数再次签名

                 3.传输给APP,发起支付

                 4.支付成功,异步回调

具体看代码

WechatAppPay是我创建的第三方类

Wxpay是处理支付的

<?php
namespace Wxpay;
 
use app\common\lib\helper\ConfigHelper;
use app\common\lib\helper\Helper;
use think\Request;
 
class WechatAppPay
{
 
    private $appid = '';
    private $partnerId = '';
    private $key = '';
    private $notify_url = '';
    const URL='https://api.mch.weixin.qq.com/pay/unifiedorder';
    function __construct()
    {
        $this->appid = ConfigHelper::getConfig('Wxpay_config')['appid'];
        $this->partnerId = ConfigHelper::getConfig('Wxpay_config')['mch_id'];
        $this->notify_url = ConfigHelper::getConfig('Wxpay_config')['notify_url'];
        $this->key = ConfigHelper::getConfig('Wxpay_config')['key'];
    }
    //生成订单
    public function wechat_pay($body, $out_trade_no, $total_fee){
        $data["appid"] = $this->appid;
        $data["mch_id"] = $this->partnerId;
        $data["nonce_str"] = $this->getRandChar(32);
        $data["body"] = $body;
        $data["notify_url"] = $this->notify_url;
        $data["out_trade_no"] = $out_trade_no;
        $data["spbill_create_ip"] = $this->get_client_ip();
        $data["total_fee"] = $total_fee;
        $data["trade_type"] = "APP";
        $time_expire = date('YmdHis',time()+1200);  //失效时间20分钟
        $data["time_expire"] = $time_expire;
 
        $sign = $this->getSign($data);
        $data["sign"] = $sign;
        //配置xml最终得到最终发送的数据
        $formData=$this->data_to_xml($data);
        $response = $this->postXmlCurl($formData,self::URL);
        //将微信返回的结果xml转成数组
        $params = (array)simplexml_load_string($response, 'SimpleXMLElement', LIBXML_NOCDATA);
        if($params['return_code'] != 'SUCCESS'){
            return Helper::ajaxFail($params);
        }else{
            $timestamp = time();
            //接收微信返回的数据,传给APP!
            $arr =array(
                'prepayid' =>$params['prepay_id'],
                'appid' => $this->appid,
                'partnerid' => $this->partnerId,
                'package' => 'Sign=WXPay',
                'noncestr' => $data["nonce_str"],
                'timestamp' => strval($timestamp),
            );
            //第二次生成签名
            $s = $this->getSign($arr);
            $arr['sign'] = $s;
            return Helper::ajaxSuccess($arr);
        }
    }
    //进行签名
    function getSign($Obj)
    {
        foreach ($Obj as $k => $v)
        {
            $arr[strtolower($k)] = $v;
        }
        ksort($arr);
        $string = $this->ToUrlParams($arr);
        $string = $string. "&key=".$this->key;
        $string = md5($string);
        $paySign = strtoupper($string);
        return $paySign;
    }
 
    public function https_request($url, $post_data = '', $timeout = 5){//curl
        $ch = curl_init();
        curl_setopt ($ch, CURLOPT_URL, $url);
        curl_setopt ($ch, CURLOPT_POST, 1);
        if($post_data != ''){
            curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
        }
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_HEADER, false);
        $file_contents = curl_exec($ch);
        curl_close($ch);
        return $file_contents;
    }
 
    public function data_to_xml( $params ){
        if(!is_array($params)|| count($params) <= 0)
        {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key=>$val){
            // if (is_numeric($val)){
            $xml.="<".$key.">".$val."</".$key.">";
            // }else{
            //     $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            // }
        }
        $xml.="</xml>";
        return $xml;
    }
    //获取指定长度的随机字符串
    private function getRandChar($length){
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol)-1;
 
        for($i=0;$i<$length;$i++){
            $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
        }
 
        return $str;
    }
 
    public function ToUrlParams($arr)
    {
        $buff = "";
        foreach ($arr as $k => $v)
        {
            if($k != "sign" && $v != "" && !is_array($v)){
                $buff .= $k . "=" . $v . "&";
            }
        }
        $buff = trim($buff, "&");
        return $buff;
    }
 
    //获取当前服务器的IP
    function get_client_ip()
    {
        if ($_SERVER['REMOTE_ADDR']) {
            $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "unknown";
        }
        return $cip;
    }
    //将数组转成uri字符串
    function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        $reqPar='';
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
                $v = urlencode($v);
            }
            $buff .= strtolower($k) . "=" . $v . "&";
        }
        if (strlen($buff) > 0)
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }
    //数组转xml
    function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key=>$val)
        {
            if (is_numeric($val))
            {
                $xml.="<".$key.">".$val."</".$key.">";
 
            }
            else
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
        }
        $xml.="</xml>";
        return $xml;
    }
    //post https请求，CURLOPT_POSTFIELDS xml格式
    function postXmlCurl($xml,$url,$second=30)
    {
        //初始化curl
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //这里设置代理，如果有的话
        curl_setopt($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($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($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);
            return false;
        }
    }
 
    //xml转成数组
    public function xmlstr_to_array($xmlstr) {
        $doc = new \DOMDocument();
        $doc->loadXML($xmlstr);
        return $this->domnode_to_array($doc->documentElement);
    }
    public function domnode_to_array($node) {
        $output = array();
        switch ($node->nodeType) {
            case XML_CDATA_SECTION_NODE:
            case XML_TEXT_NODE:
                $output = trim($node->textContent);
                break;
            case XML_ELEMENT_NODE:
                for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {
                    $child = $node->childNodes->item($i);
                    $v = $this->domnode_to_array($child);
                    if(isset($child->tagName)) {
                        $t = $child->tagName;
                        if(!isset($output[$t])) {
                            $output[$t] = array();
                        }
                        $output[$t][] = $v;
                    }
                    elseif($v) {
                        $output = (string) $v;
                    }
                }
                if(is_array($output)) {
                    if($node->attributes->length) {
                        $a = array();
                        foreach($node->attributes as $attrName => $attrNode) {
                            $a[$attrName] = (string) $attrNode->value;
                        }
                        $output['@attributes'] = $a;
                    }
                    foreach ($output as $t => $v) {
                        if(is_array($v) && count($v)==1 && $t!='@attributes') {
                            $output[$t] = $v[0];
                        }
                    }
                }
                break;
        }
        return $output;
    }
    //微信支付成功以后的回调
    public function notify()
    {
        $content = Request::instance()->getContent();
        file_put_contents('test.txt',$content);
        $result = json_decode(json_encode(simplexml_load_string($content, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        //效验签名
        $sign = $this->getSign($result);
        if ($sign == $result['sign']) {
            return $result;
        } else {
            return false;
        }
 
    }
 
 
 
 
}

<?php
namespace app\app_frontend\controller;
 
use Wxpay\WechatAppPay;
 
 
/**
 * @desc 微信支付接口
 */
 
class Wxpay extends Common {
 
    public function pay(){
        $body = '测试';
        $out_trade_no = "wx".rand(1, 20).date('YmdHis',time());  //订单号
        $total_fee = 0.01 * 100;
        $WeChat = new WechatAppPay();
        $res = $WeChat->wechat_pay($body, $out_trade_no, $total_fee);
        return $res;
    }
 
}

/**
     * @return \think\response\Json
     * @desc 微信异步通知
     */
    public function WxPayBack(){
        $WeChat = new WechatAppPay();
        $res = $WeChat->notify();
        if($res){ //签名验证通过后期处理
            if($res['result_code'] == 'SUCCESS'){
                //交易支付成功
                $data = array(
                    'out_trade_no' => $res['out_trade_no'],
                    'trade_no' => $res['transaction_id'],
                    'total_amount' => $res['total_fee'] / 100,
                    'gmt_payment' => date( 'Y-m-d H:i:s',strtotime($res['time_end']) ),
                );
                ChargeRecordModel::getInstance()->dataUpdate($data);  //订单处理
                $info = array(
                    'return_code' => 'SUCCESS',
                    'return_msg' => 'OK'
                );
                $formData=$this->arrayToXml($info);
                return $formData;
            }
        }
 
    }

配置参数：

​
        //微信支付相关配置
        'Wxpay_config' => array (
            'appid' => '',  //应用id
            'mch_id' => '',  //商户id
            'key' => '',  //商户秘钥
            'notify_url' => ''  //支付回调地址
        ),
 
​