基于php开发app微信支付接口

定义好商户支付信息

define(APPID, $payment ['appId']); // appid

define(APPSECRET, $payment ['appSecret']); // appSecret

define(MCHID, $payment ['partnerId']);//商户号
define(KEY, $payment ['partnerKey']); // 通加密串

define(NOTIFY_URL, $return_url); // 成功回调url

     //签名所需        $signArray = array(            'appid' => $payment['appId'], //appid            'mch_id' => $payment['partnerId'],            'nonce_str' => self::createNoncestr(),            'out_trade_no' => $order['order_sn'],                       'body' => $order['body'],            "total_fee" => $order ['order_amount'],            "notify_url" => $return_url,            "spbill_create_ip" => $_SERVER["REMOTE_ADDR"],            "trade_type" => "APP",        );

 $sign=self::getSign($signArray);         //统一下单        $goPay = array(            'appid' => $payment['appId'], //appid            'mch_id' => $payment['partnerId'],            'nonce_str' => $signArray['nonce_str'], //生成随机字符串            'sign' => $sign,            'out_trade_no' => $order['order_sn'],                        "total_fee" => $order ['order_amount'],             'body' => $order['body'],            "notify_url" => $return_url,             "spbill_create_ip" => $_SERVER["REMOTE_ADDR"],            "trade_type" => "APP",        );        //转化xml        $goPayXml=self::arrayToXml($goPay);        $result=self::sendPrePayCurl($goPayXml);        return $result;

生成随机字符串函数

    //随机生成字符串    html' target='_blank'>public 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;    }

签名函数

    /**     * 作用：生成签名     */    public function getSign($Obj) {        foreach ($Obj as $k => $v) {            //if($k == 'code') continue;            //if($k == 'from') continue;            $Parameters[$k] = $v;        }        //签名步骤一：按字典序排序参数        ksort($Parameters);        $String = self::formatBizQueryParaMap($Parameters, false);        //echo '【string1】'.$String.'</br>';        //签名步骤二：在string后加入KEY        $String = $String . "&key=" . KEY;               //echo "【string2】".$String."</br>";        //签名步骤三：MD5加密        $String = md5($String);        //echo "【string3】 ".$String."</br>";        //签名步骤四：所有字符转为大写        $result_ = strtoupper($String);        //echo "【result】 ".$result_."</br>";        return $result_;    }

 //格式化签名所需参数    public function formatBizQueryParaMap($paraMap, $urlencode) {        $buff = "";        ksort($paraMap);        foreach ($paraMap as $k => $v) {            if ($urlencode) {                $v = urlencode($v);            }            //$buff .= strtolower($k) . "=" . $v . "&";            $buff .= $k . "=" . $v . "&";        }        $reqPar;        if (strlen($buff) > 0) {            $reqPar = substr($buff, 0, strlen($buff) - 1);        }        return $reqPar;    }

把所要请求参数组装xml

/** * 作用：array转xml,把请求参数组装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;     }

//通过curl发送数据给微信接口的函数    public function sendPrePayCurl($xmlData) {        $url = "http://api.mch.weixin.qq.com/pay/unifiedorder";        $header[] = "Content-type: text/xml";        $curl = curl_init();        curl_setopt($curl, CURLOPT_HTTPHEADER, $header);        curl_setopt($curl, CURLOPT_URL, $url);        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);        curl_setopt($curl, CURLOPT_POST, 1);        curl_setopt($curl, CURLOPT_POSTFIELDS, $xmlData);        $data = curl_exec($curl);        if (curl_errno($curl)) {            print curl_error($curl);        }        curl_close($curl);        return self::XMLDataParse($data);    }//xml格式数据解析函数    public static function XMLDataParse($data) {        $msg = array();        $msg = (array) simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA);        return $msg;    }

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