php微信支付之如何实现APP支付

小编给大家分享一下php微信支付之如何实现APP支付，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

具体分析如下：

WechatAppPay文件代码如下：

file = __DIR__ . '/payAccessToken.txt';    }    /**     * 创建APP支付最终返回参数     * @throws \Exception     * @return multitype:string NULL     */    public function createAppPayData()    {        $this->generateConfig();        $prepayid = $this->getPrepayid();        try{            $array = [                'appid' => $this->appid,                'appkey' => $this->paySignkey,                'noncestr' => $this->getRandomStr(),                'package' => 'Sign=WXPay',                'partnerid' => $this->partnerId,                'prepayid' => $prepayid,                'timestamp' => (string)time(),            ];            $array['sign'] = $this->sha1Sign($array);            unset($array['appkey']);        } catch(\Exception $e) {            throw new \Exception($e->getMessage());        }        return $array;    }    /**     * 验证支付成功后的通知参数     *     * @throws \Exception     * @return boolean     */    public function verifyNotify()    {        try{            $staySignStr = $this->notify;            unset($staySignStr['sign']);            $sign = $this->signData($staySignStr);            return $this->notify['sign'] === $sign;        } catch(\Exception $e) {            throw new \Exception($e->getMessage());        }    }    /**     * 魔术方法，给添加支付参数进来     *     * @param string $name  参数名     * @param string $value  参数值     */    public function __set($name, $value)    {        $this->$name = $value;    }    /**     * 设置access token     * @param string $token     * @throws \Exception     * @return boolean     */    public function setAccessToken()    {        try{            if(!file_exists($this->file) || !is_file($this->file)) {                $f = fopen($this->file, 'a');                fclose($f);            }            $content = file_get_contents($this->file);            if(!empty($content)) {                $info = json_decode($content, true);                if( time() - $info['getTime'] < 7150 ) {                    $this->accessToken = $info['accessToken'];                    return true;                }            }            //文件内容为空或access token已失效，重新获取            $this->outputAccessTokenToFile();        } catch(\Exception $e) {            throw new \Exception($e->getMessage());        }        return true;    }    /**     * 写入access token 到文件     * @throws \Exception     * @return boolean     */    protected function outputAccessTokenToFile()    {        try{            $f = fopen($this->file, 'wb');            $token = [                'accessToken' => $this->getAccessToken(),                'getTime' => time(),            ];            flock($f, LOCK_EX);            fwrite($f, json_encode($token));            flock($f, LOCK_UN);            fclose($f);            $this->accessToken = $token['accessToken'];        } catch(\Exception $e) {            throw new \Exception($e->getMessage());        }        return true;    }    /**     * 取access token     *     * @throws \Exception     * @return string     */    protected function getAccessToken()    {        $url = sprintf(self::ACCESS_TOKEN_URL, $this->appid, $this->appSecret);        $result = json_decode( $this->getUrl($url), true );        if(isset($result['errcode'])) {            throw new \Exception("get access token failed:{$result['errmsg']}");        }        return $result['access_token'];    }    /**     * 取预支付会话标识     *     * @throws \Exception     * @return string     */    protected function getPrepayid()    {        $data = json_encode($this->config);        $url = sprintf(self::POST_ORDER_URL, $this->accessToken);        $result = json_decode( $this->postUrl($url, $data), true );        if( isset($result['errcode']) && $result['errcode'] != 0 ) {            throw new \Exception($result['errmsg']);        }        if( !isset($result['prepayid']) ) {            throw new \Exception('get prepayid failed, url request error.');        }        return $result['prepayid'];    }    /**     * 组装预支付参数     *     * @throws \Exception     */    protected function generateConfig()    {        try{            $this->config = [                    'appid' => $this->appid,                    'traceid' => $this->traceid,                    'noncestr' => $this->getRandomStr(),                    'timestamp' => time(),                    'package' => $this->generatePackage(),                    'sign_method' => $this->sign_method,            ];            $this->config['app_signature'] = $this->generateSign();        } catch(\Exception $e) {            throw new \Exception($e->getMessage());        }    }    /**     * 生成package字段     *     * 生成规则:     * 1、生成sign的值signValue     * 2、对package参数再次拼接成查询字符串，值需要进行urlencode     * 3、将sign=signValue拼接到2生成的字符串后面得到最终的package字符串     *     * 第2步urlencode空格需要编码成%20而不是+     *     * RFC 1738会把 空格编码成+     * RFC 3986会把空格编码成%20     *     * @return string     */    protected function generatePackage()    {        $this->package['sign'] = $this->signData($this->package);        return http_build_query($this->package, '', '&', PHP_QUERY_RFC3986);    }    /**     * 生成签名     *     * @return string     */    protected function generateSign()    {        $signArray = [            'appid' => $this->appid,            'appkey' => $this->paySignkey,            'noncestr' => $this->config['noncestr'],            'package' => $this->config['package'],            'timestamp' => $this->config['timestamp'],            'traceid' => $this->traceid,        ];        return $this->sha1Sign($signArray);    }    /**     * 签名数据     *     * 生成规则:     * 1、字典排序，拼接成查询字符串格式，不需要urlencode     * 2、上一步得到的字符串最后拼接上key=paternerKey     * 3、MD5哈希字符串并转换成大写得到sign的值signValue     *     * @param array $data 待签名数据     * @return string 最终签名结果     */    protected function signData($data)    {        ksort($data);        $str = $this->arrayToString($data);        $str .= "&key={$this->partnerKey}";        return strtoupper( $this->signMd5($str) );    }    /**     * sha1签名     * 签名规则     * 1、字典排序     * 2、拼接查询字符串     * 3、sha1运算     *     * @param array $arr     * @return string     */    protected function sha1Sign($arr)    {        ksort($arr);        return sha1( $this->arrayToString($arr) );    }}

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