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微信公众号支付
发表于 2016-1-25 | PHP 
<?php

/**
 * 微信支付驱动
 * @author  Devil
 * @version V_1.0.0
 */
class WechatPayLibrary
{
    private $appid;
    private $secret;
    private $mch_id;
    private $key;

    /**
     * [__construct 构造方法]
     */
    private function __construct($config)
    {
        $this->appid = isset($config['appid']) ? $config['appid'] : '';
        $this->secret = isset($config['secret']) ? $config['secret'] : '';
        $this->mch_id = isset($config['mchid']) ? $config['mchid'] : '';
        $this->key = isset($config['key']) ? $config['key'] : '';
    }

    /**
     * [Instantiate 静态方法]
     * @param [array] $config   [微信配置信息]
     * @return[object]          [当前类对象]
     */
    public static function Instantiate($config)
    {
        $object = null;
        if(!is_object($object)) $object = new self($config);
        return $object;
    }

    /**
     * [WechatPay 微信支付]
     * @param [string] $param['body']           [商品简要描述]
     * @param [string] $param['out_trade_no']   [商户订单号]
     * @param [array] $param['total_fee']       [订单总金额]
     * @param [array] $param['notify_url']      [异步通知地址]
     * @param [array] $param['trade_type']      [交易JSAPI类型]
     * @return[array]                           [微信支付数据]
     */
    public function WechatPay($param)
    {
        if(empty($param)) return '';

        $data = $this->GetPayParam($param);

        $xml = '<xml>
                <appid>'.$this->appid.'</appid>
                <body>'.$data['data']['body'].'</body>
                <mch_id>'.$this->mch_id.'</mch_id>
                <nonce_str>'.$data['data']['nonce_str'].'</nonce_str>
                <notify_url>'.$data['data']['notify_url'].'</notify_url>
                <openid>'.$data['data']['openid'].'</openid>
                <out_trade_no>'.$data['data']['out_trade_no'].'</out_trade_no>
                <spbill_create_ip>'.$data['data']['spbill_create_ip'].'</spbill_create_ip>
                <total_fee>'.$data['data']['total_fee'].'</total_fee>
                <trade_type>'.$data['data']['trade_type'].'</trade_type>
                <sign>'.$data['sign'].'</sign>
            </xml>';

        $result = $this->Xml_Array($this->Curl_Post('https://api.mch.weixin.qq.com/pay/unifiedorder', $xml));
        if(!empty($result))
        {
            // 返回数据
            $pay_data = array(
                    'appId'         =>  $this->appid,
                    'timeStamp'     =>  time(),
                    'signType'      =>  'MD5',
                    'nonceStr'      =>  md5(time().rand()),
                    'package'       =>  'prepay_id='.$result['prepay_id'],
                );
            $pay_data['paySign'] = $this->GetParamSing($pay_data);

            return $pay_data;
        }
        return '';
    }

    /**
     * [Xml_Array xml转数组]
     * @param [string] $xml [xml字符串]
     * @return[array]       [数组]
     */
    private function Xml_Array($xml)
    {
        if(!Xml_Parser($xml)) return '';

        return json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    }

    /**
     * [GetPayParam 获取支付参数]
     * @param [array] $param [支付的数据]
     * @return[array] [支付的字符串和签名]
     */
    private function GetPayParam($param)
    {
        if(empty($param)) return '';

        $param['appid'] = $this->appid;
        $param['mch_id'] = $this->mch_id;
        $param['nonce_str'] = md5(time().rand().$param['out_trade_no']);
        $param['spbill_create_ip'] = get_client_ip();
        $param['trade_type'] = 'JSAPI';
        return array(
            'sign'  =>  $this->GetParamSing($param),
            'data'  =>  $param,
        );
    }

    /**
     * [GetParamSing 签名生成]
     * @param [array] $param    [需要参与签名的数据]
     * @return[string]          [签名]
     */
    private function GetParamSing($param)
    {
        if(empty($param)) return '';

        ksort($param);
        $sign  = '';
        foreach($param as $k=>$v)
        {
            if($k != 'sign') $sign .= "$k=$v&";
        }
        return strtoupper(md5($sign.'key='.$this->key));
    }

    /**
     * [Curl_Post curl模拟post]
     * @param  [string] $url  [请求地址]
     * @param  [array] $post  [发送的post数据]
     */
    private function Curl_Post($url, $post)
    {
        $options = array(
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HEADER         => false,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => $post,
        );

        $ch = curl_init($url);
        curl_setopt_array($ch, $options);
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
    }

    /**
     * [Notify 异步回调]
     * @return [array] [支付数据]
     */
    public function Notify()
    {
        $result = empty($GLOBALS['HTTP_RAW_POST_DATA']) ? '' : $this->Xml_Array($GLOBALS['HTTP_RAW_POST_DATA']);

        if(isset($result['sign']) && $result['sign'] == $this->GetParamSing($result)) return $result;
        return '';
    }
}
?>

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