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
        ),
 
​