youxiangjie/application/common/lib/WxPay.php

<?php
namespace app\common\lib;

class WxPay
{
    private $config = array(
        'appid' => "",  // 微信开放平台上的应用id
        'mch_id' => "1550903451", // 微信申请成功之后的商户号
        'api_key' => "b3ae6bbf3cc4fa017eb169ae219e2c27" // 在微信商户平台上自己设定的32位api密钥
    );

    /**
     * 发起预支付订单
     *
     * $body 订单描述
     * $out_trade_no 订单号
     * $total_fee 订单金额，单位为 分
     * $notify_url 异步通知回调地址
     */
    public function getPrePayOrder($body, $out_trade_no, $total_fee, $notify_url)
    {
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

        $onoce_str = $this->getRandChar(32);

        $data["appid"] = $this->config["appid"];
        $data["body"] = $body;
        $data["mch_id"] = $this->config['mch_id'];
        $data["nonce_str"] = $onoce_str;
        $data["notify_url"] = $notify_url;
        $data["out_trade_no"] = $out_trade_no;
        $data["spbill_create_ip"] = $this->get_client_ip();
        $data["total_fee"] = $total_fee;
        $data["trade_type"] = "APP";
        $s = $this->getSign($data, false);
        $data["sign"] = $s;
        $xml = $this->arrayToXml($data);
        $response = $this->postXmlCurl($xml, $url);

        //将微信返回的结果xml转成数组
        return $this->xmltoarray($response);
    }
    public function getOrder($prepayId)
    {
        $data["appid"] = $this->config["appid"];
        $data["noncestr"] = $this->getRandChar(32);;
        $data["package"] = "Sign=WXPay";
        $data["partnerid"] = $this->config['mch_id'];
        $data["prepayid"] = $prepayId;
        $data["timestamp"] = time();
        $sign = $this->getSign($data, false);
        $data["sign"] = $sign;

        return $data;
    }
    //生成签名
    function getSign($obj)
    {
        foreach ($obj as $k => $v) {
            $Parameters[strtolower($k)] = $v;
        }
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        $String = $String."&key=".$this->config['api_key'];
        //签名步骤三：MD5加密
        $result = strtoupper(md5($String));
        return $result;
    }
    //获取指定长度的随机字符串
    function getRandChar($length)
    {
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol) - 1;
        //rand($min,$max)生成介于min和max两个数之间的一个随机整数
        for ($i=0;$i<$length;$i++) {
            $str.= $strPol[rand(0,$max)];
	}
        return $str;
    }
    //数组转xml
    function arrayToXml($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 $xml;
    }
    //post https请求，CURLOPT_POSTFIELDS xml 格式
    function postXmlCurl($xml, $url, $second = 30)
    {
        //初始化curl
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."<br>";
            echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
            curl_close($ch);
            return false;
        }
    }
    //获取当前服务器的IP
    function get_client_ip()
    {
        if ($_SERVER['REMOTE_ADDR']) {
            $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "unknown";
        }
        return $cip;
    }
    //将数组转成uri字符串
    function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff.= strtolower($k) . "=" . $v . "&";
	    }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }
    //xml转成数组
    public function xmltoarray($xml)
    {
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml,'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring),true);
        return $val;
    }
    function domnode_to_array($node)
    {
        $output = array();
        switch ($node->nodeType) {
            case XML_CDATA_SECTION_NODE:
            case XML_TEXT_NODE:
                $output = trim($node->textContent);
                break;
            case XML_ELEMENT_NODE:
                for ($i=0, $m=$node->childNodes->length; $i < $m; $i++) {
                    $child = $node->childNodes->item($i);
                    $v = $this->domnode_to_array($child);
                    if (isset($child->tagName)) {
                        $t = $child->tagName;
                        if (!isset($output[$t])) {
                            $output[$t] = array();
                        }
                        $output[$t][] = $v;
                    } elseif ($v) {
                        $output = (string)$v;
                    }
                }
                if (is_array($output)) {
                    if ($node->attributes->length) {
                        $a = array();
                        foreach ($node->attributes as $attrName => $attrNode) {
                            $a[$attrName] = (string) $attrNode->value;
                        }
                        $output['@attributes'] = $a;
                    }
                    foreach ($output as $t => $v) {
                        if (is_array($v) && count($v)==1 && $t!='@attributes') {
                            $output[$t] = $v[0];
                        }
                    }
                }
                break;
        }
        return $output;
    }
}