微信公众号支付

这里使用的tp5
首先将下面的文件放到extend文件夹下

<?php  
namespace wxpay;

class WeixinPay {

    protected $appid;  

    protected $mch_id;  

    protected $key;  

    protected $openid;  

    protected $out_trade_no; 

    protected $body;  

    protected $total_fee;  

    protected $identity;

    protected $sub_mchid;

    protected $attach;

    function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee,$identity,$sub_mchid,$attach="") {  

        $this->appid = $appid;  

        $this->openid = $openid;  

        $this->mch_id = $mch_id;  

        $this->key = $key;  

        $this->out_trade_no = $out_trade_no;  

        $this->body = $body;  

        $this->total_fee = $total_fee; 

        $this->identity = $identity;  

        $this->sub_mchid = $sub_mchid;   

        $this->attach = $attach;

    } 

     

    public function pay() {  

        //统一下单接口  

        $return = $this->weixinapp();  

        return $return;  

    }  

    //统一下单接口  

    private function unifiedorder() {  

        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';  

        $parameters = array(  

            'appid' => $this->appid, //小程序ID  

                'body' => $this->body,

                'mch_id' => $this->mch_id, //商户号  

                'nonce_str' => $this->createNoncestr(), //随机字符串  

//            'body' => 'test', //商品描述  

            //   'out_trade_no' => '', //商户订单号  

            //  'total_fee' => floatval(0.01 * 100), //总金额 单位 分    

            //  'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP  

            //  'spbill_create_ip' => '192.168.0.161', //终端IP  

                'notify_url' => $this->getNotifyUrl('/Wxpay/notify'), //通知地址  确保外网能正常访问  

                'out_trade_no'=> $this->out_trade_no,  
                
                'total_fee' => $this->total_fee,

                'trade_type' => 'JSAPI'//交易类型  

            );  

        if($this->identity == 1){
            $parameters['openid'] = $this->openid; //用户id  
        }
        if($this->identity == 2){
            $parameters['sub_appid'] = $this->appid; //小程序ID            
            $parameters['sub_mch_id'] = $this->mch_id; //商户号  
            $parameters['sub_openid'] = $this->openid; //用户id  
        }
        
        //自定义参数 （里面是订单类型|表单id|小程序id）
        if($this->attach){
            $parameters['attach'] = $this->attach;
        }

        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $xmlData = $this->arrayToXml($parameters);  


        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));

        return $return;  

    }  

    protected function getNotifyUrl($url){
      

      
        $current_url ='https://' . $_SERVER['HTTP_HOST'].$url;

      
        return $current_url;
    }

    private static function postXmlCurl($xml, $url, $second = 30)   

    {  

        $ch = curl_init();  

        //设置超时  

        curl_setopt($ch, CURLOPT_TIMEOUT, $second);  

        curl_setopt($ch, CURLOPT_URL, $url);  

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);  

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验  

        //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);  

        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);  

        curl_setopt($ch, CURLOPT_TIMEOUT, 40);  

        set_time_limit(0);  

        //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);  

            throw new WxPayException("curl出错，错误码:$error");  

        }  

    }  

    //数组转换成xml  

    protected function arrayToXml($arr) {  

        $xml = "<root>";  

        foreach ($arr as $key => $val) {  

            if (is_array($val)) {  

                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";  

            } else {  

                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";  

            }  

        }  

        $xml .= "</root>";  

        return $xml;  

    }  

    //xml转换成数组  

    protected function xmlToArray($xml) {  

        //禁止引用外部xml实体   

        libxml_disable_entity_loader(true);  

        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);  

        $val = json_decode(json_encode($xmlstring), true);  

        return $val;  

    }  

    //微信小程序接口  

    private function weixinapp() {  

        //统一下单接口  

        $unifiedorder = $this->unifiedorder();
   
//        print_r($unifiedorder);  

        $parameters = array(  

            'appId' => $this->appid, //小程序ID  

            'timeStamp' => '' . time() . '', //时间戳  

            'nonceStr' => $this->createNoncestr(), //随机串  

            'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包  

            'signType' => 'MD5'//签名方式  

        );  

        //签名  

        $parameters['paySign'] = $this->getSign($parameters);  

        return $parameters;  

    }  

    //作用：产生随机字符串，不长于32位  

    protected function createNoncestr($length = 32) {  

        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";  

        $str = "";  

        for ($i = 0; $i < $length; $i++) {  

            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);  

        }  

        return $str;  

    }  



    //作用：生成签名  

    protected function getSign($Obj) {  

        foreach ($Obj as $k => $v) {  

            $Parameters[$k] = $v;  

        }  

        //签名步骤一：按字典序排序参数  

        ksort($Parameters);  

        $String = $this->formatBizQueryParaMap($Parameters, false);  

        //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  

        $result_ = strtoupper($String);  

        return $result_;  

    }  



    ///作用：格式化参数，签名过程需要使用  

    protected function formatBizQueryParaMap($paraMap, $urlencode) {  

        $buff = "";  

        ksort($paraMap);  

        foreach ($paraMap as $k => $v) {  

            if ($urlencode) {  

                $v = urlencode($v);  

            }  

            $buff .= $k . "=" . $v . "&";  

        }  

        $reqPar;  

        if (strlen($buff) > 0) {  

            $reqPar = substr($buff, 0, strlen($buff) - 1);  

        }  

        return $reqPar;  

    }  

}  

支付界面当中
我这边先判断了一下是不是微信浏览器

// 判断浏览器类型
    var _browser="";
    if (/MicroMessenger/.test(window.navigator.userAgent)) {
       _browser="wechat";
    } else if (/AlipayClient/.test(window.navigator.userAgent)) {
      _browser="alipay";
    } else {
        _browser="other";
    }

然后判断用户信息 appid 路径自己设置 还可以设置不同的参数 参考后面拼接的info.id

// 微信进入判断用户信息
    if(_browser=="wechat"){
        if(!window.localStorage.getItem("u_id") && !GetQueryString("code")){
            window.location.href="https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxxxxx&redirect_uri=http://pay.xxxxx.com/index/pay/index?id="+{$info.id}+"&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
        }else if(!window.localStorage.getItem("u_id") && GetQueryString("code")){
            $.post("/index/pay/getopenid",{code:GetQueryString("code")},function(e){
                console.log(e.data.openid)
                openid=e.data.openid;
                window.localStorage.setItem("u_id",e.data.openid)
            },"json")
        }else if(window.localStorage.getItem("u_id")){
            openid=window.localStorage.getItem("u_id")
        }
    }

上面的getopenid方法

//微信获取openid
function getopenid(){
    $appid      = 'xxx';
$appsecret  = 'xxx';
$code       = $_REQUEST['code'];


//第一步:取全局access_token
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$appid}&secret={$appsecret}";

$token = $this->_requestGetcurl($url);
//第二步:取得openid
$oauth2Url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$appid}&secret={$appsecret}&code={$code}&grant_type=authorization_code";
$oauth2 = $this->_requestGetcurl($oauth2Url);
$openid = $oauth2['openid'];//输出openid
if ($openid)
{
    $data = array(
        "openid" => $openid,
    );
    $adata['res']   = 1;
    $adata['data']  = $data;
    echo json_encode($adata);
    exit;
}
}


public function _requestGetcurl($url)
{
    //curl完成
    $curl = curl_init();
    //设置curl选项
    $header = array(
        "authorization: Basic YS1sNjI5dmwtZ3Nocmt1eGI2Njp1TlQhQVFnISlWNlkySkBxWlQ=",
        "content-type: application/json",
        "cache-control: no-cache",
        "postman-token: cd81259b-e5f8-d64b-a408-1270184387ca"
    );
    curl_setopt($curl, CURLOPT_HEADER, 1);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
    curl_setopt($curl, CURLOPT_URL, $url);//URL
    curl_setopt($curl, CURLOPT_HEADER, 0);             // 0：不返回头信息
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_TIMEOUT, 30);//设置超时时间
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    // 发出请求
    $response = curl_exec($curl);
    if (false === $response) {
        echo '<br>', curl_error($curl), '<br>';
        return false;
    }
    curl_close($curl);
    $forms = stripslashes(html_entity_decode($response));
    $forms = json_decode($forms, TRUE);
    return $forms;
}

然后就是支付界面的提交 下面的post方法

//填写信息
    $('.submit').click(function(e){
        var money=$.trim($('#div').html());
        var receiveid=$("#receiveid").val();
        var businessmanid=$("#businessmanid").val();
        if(!(money>0)){
            alert("请输入大于零的数字")
            return false;
        }
//          alert("浏览器"+_browser);
//          alert("付款金额"+money);
//          alert("aaa="+UrlSearch());
        //提交信息 _browser浏览器信息  钱数money 用户id
        // e.preventDefault();      //阻止表单提交
        if(_browser=="wechat"){
            $.post("/index/wxpay/pay",{openid:openid,money:money,receiveid:receiveid,businessmanid:businessmanid},function(e){
                console.log(e)
                WeixinJSBridge.invoke(
                    'getBrandWCPayRequest', {
                        "appId":e.info.appId,     //公众号名称，由商户传入     
                        "timeStamp":e.info.timeStamp,         //时间戳，自1970年以来的秒数     
                        "nonceStr":e.info.nonceStr, //随机串     
                        "package":e.info.package,     
                        "signType":"MD5",         //微信签名方式：     
                        "paySign":e.info.paySign, //微信签名 

                    },
                    function(res){
                        if(res.err_msg == "get_brand_wcpay_request:ok" ){
                            alert("支付成功")
                        }
                    }
                );
            },"json")
        }
    })

提交到控制器 然后写到数据库里一个预订单 再返回给前端 前端根据返回信息调用上面的WeixinJSBridge.invoke 方法 这时会唤起支付的小窗口 让用户输入密码
输入完密码 支付完成 此时微信服务器会给回调方法发送支付成功的信息 将收取的信息订单号进行查询 更改状态即可
回调方法还没写