app微信支付服务端

<?php
namespace app\api\controller;
use think\Db;
class WxPay{
public function pay($body_name='',$order_number='',$fee='') {
    $wxdata = Db::name('wxpay')->find();
    $appid = $wxdata['appid']; //应用的appid
    $mch_id = $wxdata['mch_id']; // 您的商户账号
    $nonce_str = $this -> nonce_str(); //随机字符串
    $body = $body_name; // 举例: 服务预约
    $out_trade_no = $order_number; //商户订单号
    $total_fee = $fee*100;
    $spbill_create_ip = '122.114.62.70'; // IP白名单
    $notify_url = 'http://app.ggg.com/api/Notify/Wx_notify'; // 回调的url【自己填写,如若回调不成功请注意查看服务器是否开启防盗链,回调地址用http】
    $trade_type = 'APP'; //交易类型 默认
        //这里是按照顺序的 因为下面的签名是按照顺序 排序错误 肯定出错
        $post['appid'] = $appid;
        $post['body'] = $body;
        $post['mch_id'] = $mch_id;
        $post['nonce_str'] = $nonce_str; //随机字符串
        $post['notify_url'] = $notify_url;
        $post['out_trade_no'] = $out_trade_no;
        $post['spbill_create_ip'] = $spbill_create_ip; //终端的ip
        $post['total_fee'] = $total_fee; //总金额 最低为一块钱 必须是整数
        $post['trade_type'] = $trade_type;
        $sign = $this -> sign($post,$wxdata['key']); //签名
        $post_xml = "<xml>
                       <appid><![CDATA[$appid]]></appid>
                       <body><![CDATA[$body]]></body>
                       <mch_id><![CDATA[$mch_id]]></mch_id>
                       <nonce_str><![CDATA[$nonce_str]]></nonce_str>
                       <notify_url><![CDATA[$notify_url]]></notify_url>
                       <out_trade_no><![CDATA[$out_trade_no]]></out_trade_no>
                       <spbill_create_ip><![CDATA[$spbill_create_ip]]></spbill_create_ip>
                       <total_fee><![CDATA[$total_fee]]></total_fee>
                       <trade_type><![CDATA[$trade_type]]></trade_type>
                       <sign><![CDATA[$sign]]></sign>
                    </xml>";
        //统一接口prepay_id
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $xml = $this -> http_request($url, $post_xml);
        $array = $this -> xml($xml); //全要大写
//            dump($array);die;
        if ($array['RETURN_CODE'] == 'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS') {
            $time = time();
            $tmp = []; //临时数组用于签名
            $tmp['appid'] = $appid;
            $tmp['noncestr'] = $nonce_str;
            $tmp['package'] = 'Sign=WXPay';
            $tmp["partnerid"] = $mch_id;
            $tmp['prepayid'] = $array['PREPAY_ID'];
            $tmp['timestamp'] = "$time";
            $data['appid'] = $appid;
            $data['noncestr'] = $nonce_str; //随机字符串
//                $data['package'] = 'prepay_id='.$array['PREPAY_ID']; //统一接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
            $data['package'] = "Sign=WXPay";
            $data['partnerid']= $mch_id;
            $data['prepayid'] = $array['PREPAY_ID'];
            $data['timestamp'] = "$time"; //时间戳
            $data['sign'] = $this ->sign($tmp,$wxdata['key']);//签名
        } else {
            $data['status'] = 0;
            $data['text'] = "错误";
            $data['RETURN_CODE'] = $array['RETURN_CODE'];
            $data['RETURN_MSG'] = $array['RETURN_MSG'];
        }
        return json_encode($data);
    }
public function sign($data,$wx_key)
{
//签名 $data要先排好顺序
    $stringA = '';
    ksort($data);
    foreach($data as $key => $value) {
        if (!$value) continue;
        if ($stringA)
            $stringA.= '&'.$key."=".$value;
        else
            $stringA = $key."=".$value;
        }
    $stringSignTemp = $stringA.'&key='.$wx_key; //申请支付后有给予一个商户账号和密码，登陆后自己设置key
    return strtoupper(md5($stringSignTemp));
}
//随机32位字符串
private function nonce_str() {
    $result = '';
    $str = 'QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz';
    for ($i = 0; $i < 32; $i++) {
        $result.= $str[rand(0, 48)];
        }
    return $result;
}
//curl请求啊
public function http_request($url, $data = null, $headers = array()) {
    $curl = curl_init();
    if (count($headers) >= 1) {
        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    }
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    if (!empty($data)) {
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($curl);
    curl_close($curl);
    return $output;
}
//获取xml
private function xml($xml) {
    $p = xml_parser_create();
    xml_parse_into_struct($p, $xml, $vals, $index);
    xml_parser_free($p);
    $data = "";
    foreach($index as $key => $value) {
        if ($key == 'xml' || $key == 'XML') continue;
        $tag = $vals[$value[0]]['tag'];
        $value = $vals[$value[0]]['value'];
        $data[$tag] = $value;
    }
    return $data;
}
}
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