微信小程序与php 实现微信支付的简单实例

微信小程序与php 实现微信支付的简单实例

小程序访问地址：

payfee.PHP:

include 'WeixinPay.php';
$appid='';
$openid= $_GET['id'];
$mch_id='';
$key='';
$out_trade_no = $mch_id. time();
$total_fee = $_GET['fee'];
if(empty($total_fee)) //押金
{
  $body = "充值押金";
  $total_fee = floatval(99*100);
}
 else {
   $body = "充值余额";
   $total_fee = floatval($total_fee*100);
 }
$weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);
$return=$weixinpay->pay(); 

echo json_encode($return);

WeixinPay.php:

<?php 

/*
 * 小程序微信支付
 */ 

class WeixinPay { 

  protected $appid;
  protected $mch_id;
  protected $key;
  protected $openid;
  protected $out_trade_no;
  protected $body;
  protected $total_fee;
      function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) {
    $this->appid = $appid;
    $this->openid = $openid;
    $this->mch_id = $mch_id;
    $this->key = $key;
    $this->out_trade_no = $out_trade_no;
    $this->body = $body;
    $this->total_fee = $total_fee;
  } 

  public function pay() {
    //统一下单接口
    $return = $this->weixinapp();
    return $return;
  } 

  //统一下单接口
  private function unifiedorder() {
    $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
    $parameters = array(
      'appid' => $this->appid, //小程序ID
      'mch_id' => $this->mch_id, //商户号
      'nonce_str' => $this->createNoncestr(), //随机字符串
//      'body' => 'test', //商品描述
      'body' => $this->body,
//      'out_trade_no' => '2015450806125348', //商户订单号
      'out_trade_no'=> $this->out_trade_no,
//      'total_fee' => floatval(0.01 * 100), //总金额 单位 分
      'total_fee' => $this->total_fee,
//      'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
      'spbill_create_ip' => '192.168.0.161', //终端IP
      'notify_url' => 'http://www.weixin.qq.com/wxpay/pay.php', //通知地址 确保外网能正常访问
      'openid' => $this->openid, //用户id
      'trade_type' => 'JSAPI'//交易类型
    );
    //统一下单签名
    $parameters['sign'] = $this->getSign($parameters);
    $xmlData = $this->arrayToXml($parameters);
    $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
    return $return;
  } 

  private static function postXmlCurl($xml, $url, $second = 30)
  {
    $ch = curl_init();
    //设置超时
    curl_setopt($ch, CURLOPT_TIMEOUT, $second);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
    //设置header
    curl_setopt($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); 

    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
    curl_setopt($ch, CURLOPT_TIMEOUT, 40);
    set_time_limit(0); 

    //运行curl
    $data = curl_exec($ch);
    //返回结果
    if ($data) {
      curl_close($ch);
      return $data;
    } else {
      $error = curl_errno($ch);
      curl_close($ch);
      throw new WxPayException("curl出错，错误码:$error");
    }
  } 

  //数组转换成xml
  private function arrayToXml($arr) {
    $xml = "<root>";
    foreach ($arr as $key => $val) {
      if (is_array($val)) {
        $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
      } else {
        $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
      }
    }
    $xml .= "</root>";
    return $xml;
  } 

  //xml转换成数组
  private 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;
  } 

  //微信小程序接口
  private function weixinapp() {
    //统一下单接口
    $unifiedorder = $this->unifiedorder();
//    print_r($unifiedorder);
    $parameters = array(
      'appId' => $this->appid, //小程序ID
      'timeStamp' => '' . time() . '', //时间戳
      'nonceStr' => $this->createNoncestr(), //随机串
      'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包
      'signType' => 'MD5'//签名方式
    );
    //签名
    $parameters['paySign'] = $this->getSign($parameters);
    return $parameters;
  } 

  //作用：产生随机字符串，不长于32位
  private function createNoncestr($length = 32) {
    $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  } 

  //作用：生成签名
  private function getSign($Obj) {
    foreach ($Obj as $k => $v) {
      $Parameters[$k] = $v;
    }
    //签名步骤一：按字典序排序参数
    ksort($Parameters);
    $String = $this->formatBizQueryParaMap($Parameters, false);
    //签名步骤二：在string后加入KEY
    $String = $String . "&key=" . $this->key;
    //签名步骤三：MD5加密
    $String = md5($String);
    //签名步骤四：所有字符转为大写
    $result_ = strtoupper($String);
    return $result_;
  } 

  ///作用：格式化参数，签名过程需要使用
  private function formatBizQueryParaMap($paraMap, $urlencode) {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
      if ($urlencode) {
        $v = urlencode($v);
      }
      $buff .= $k . "=" . $v . "&";
    }
    $reqPar;
    if (strlen($buff) > 0) {
      $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
  } 

}

小程序页面处理：

wx.request({
url:'https://www.yourhost.com/weixin/WeiActivity/payfee.php',//改成你自己的链接
header:{
'Content-Type':'application/x-www-form-urlencoded'
},
method:'POST',
success:function(res){
console.log(res.data);
console.log('调起支付');
wx.requestPayment({
'timeStamp': res.data.timeStamp,
'nonceStr': res.data.nonceStr,
'package': res.data.package,
'signType':'MD5',
'paySign': res.data.paySign,
'success':function(res){
console.log('success');
wx.showToast({
title:'支付成功',
icon:'success',
duration:3000
});
},
'fail':function(res){
console.log('fail');
},
'complete':function(res){
console.log('complete');
}
});
},
fail:function(res){
console.log(res.data)
}
});

回调url:notify.php

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数
if (empty($postXml)) {
  return false;
} 

//将xml格式转换成数组
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;
} 

$attr = xmlToArray($postXml); 

$total_fee = $attr[total_fee];
$open_id = $attr[openid];
$out_trade_no = $attr[out_trade_no];
$time = $attr[time_end];

以上几步你就可以完成小程序的微信支付与php完美的结合起来

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