php微信支付之APP支付方法

本文实例讲述了微信开放平台移动应用集成微信支付功能。分享给大家供大家参考。具体分析如下：

wechatapppay文件代码如下：

<?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) );
    }
}

希望本文所述对大家的php程序设计有所帮助。