复制代码 代码如下:

<?php
namespace common\\services\\WechatPay;
class WechatAppPay extends WechatPayBase
{
    //package参数
    public $package = [];
    //异步通知参数
    public $notify = [];
    //推送预支付订单参数
    protected $config = [];
    //存储access token和获取时间的文件
    protected $file;
    //access token
    protected $accessToken;
    //取access token的url
    const ACCESS_TOKEN_URL = \'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s\';
    //生成预支付订单提交地址
    const POST_ORDER_URL = \'https://api.weixin.qq.com/pay/genprepay?access_token=%s\';
    public function __construct()
    {
        $this->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) );
    }
}