PHP implements WeChat native payment (scan code payment) function

This article mainly introduces PHP to implement WeChat native payment and scan code payment functions in detail. It has a certain reference value. Interested friends can refer to

Many PHP WeChat Scanners on the Internet The code payment access tutorials are quite complicated and require configuration and introduction of many files. After sorting them out, I have given a single file version with only 200 lines of code. I hope it can help everyone who wants to access WeChat scan code payment. Here's some help and reference.

Run this file directly to get a picture of the payment QR code.

Things to note:

1. This file needs to be placed in the payment authorization directory, which can be set in WeChat Payment Merchant Platform->Product Center->Development Configuration.
2. If a signature error is prompted, you can verify it through the WeChat payment signature verification tool: WeChat public platform payment interface debugging tool

The code is as follows:

<?php
header(&#39;Content-type:text/html; Charset=utf-8&#39;);
$mchid = &#39;xxxxx&#39;;     //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = &#39;xxxxx&#39;; //公众号APPID 通过微信支付商户资料审核后邮件发送
$apiKey = &#39;xxxxx&#39;;  //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
$wxPay = new WxpayService($mchid,$appid,$apiKey);
$outTradeNo = uniqid();   //你自己的商品订单号
$payAmount = 0.01;     //付款金额，单位:元
$orderName = &#39;支付测试&#39;;  //订单标题
$notifyUrl = &#39;https://www.xxx.com/wx/&#39;;   //付款成功后的回调地址(不要有问号)
$payTime = time();   //付款时间
$arr = $wxPay->createJsBizPackage($payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);
//生成二维码
$url = &#39;http://qr.liantu.com/api.php?text=&#39;.$arr[&#39;code_url&#39;];
echo "<img src=&#39;{$url}&#39; style=&#39;width:300px;&#39;>";

class WxpayService
{
  protected $mchid;
  protected $appid;
  protected $apiKey;

  public function __construct($mchid, $appid, $key)
  {
    $this->mchid = $mchid;
    $this->appid = $appid;
    $this->apiKey = $key;
  }

  /**
   * 发起订单
   * @param float $totalFee 收款总费用 单位元
   * @param string $outTradeNo 唯一的订单号
   * @param string $orderName 订单名称
   * @param string $notifyUrl 支付结果通知url 不要有问号
   * @param string $timestamp 订单发起时间
   * @return array
   */
  public function createJsBizPackage($totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)
  {
    $config = array(
      &#39;mch_id&#39; => $this->mchid,
      &#39;appid&#39; => $this->appid,
      &#39;key&#39; => $this->apiKey,
    );
    $orderName = iconv(&#39;GBK&#39;,&#39;UTF-8&#39;,$orderName);
    $unified = array(
      &#39;appid&#39; => $config[&#39;appid&#39;],
      &#39;attach&#39; => &#39;pay&#39;,       //商家数据包，原样返回，如果填写中文，请注意转换为utf-8
      &#39;body&#39; => $orderName,
      &#39;mch_id&#39; => $config[&#39;mch_id&#39;],
      &#39;nonce_str&#39; => self::createNonceStr(),
      &#39;notify_url&#39; => $notifyUrl,
      &#39;out_trade_no&#39; => $outTradeNo,
      &#39;spbill_create_ip&#39; => &#39;127.0.0.1&#39;,
      &#39;total_fee&#39; => intval($totalFee * 100),    //单位 转为分
      &#39;trade_type&#39; => &#39;NATIVE&#39;,
    );
    $unified[&#39;sign&#39;] = self::getSign($unified, $config[&#39;key&#39;]);
    $responseXml = self::curlPost(&#39;https://api.mch.weixin.qq.com/pay/unifiedorder&#39;, self::arrayToXml($unified));
    $unifiedOrder = simplexml_load_string($responseXml, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
    if ($unifiedOrder === false) {
      die(&#39;parse xml error&#39;);
    }
    if ($unifiedOrder->return_code != &#39;SUCCESS&#39;) {
      die($unifiedOrder->return_msg);
    }
    if ($unifiedOrder->result_code != &#39;SUCCESS&#39;) {
      die($unifiedOrder->err_code);
    }
    $codeUrl = (array)($unifiedOrder->code_url);
    if(!$codeUrl[0]) exit(&#39;get code_url error&#39;);
    $arr = array(
      "appId" => $config[&#39;appid&#39;],
      "timeStamp" => $timestamp,
      "nonceStr" => self::createNonceStr(),
      "package" => "prepay_id=" . $unifiedOrder->prepay_id,
      "signType" => &#39;MD5&#39;,
      "code_url" => $codeUrl[0],
    );
    $arr[&#39;paySign&#39;] = self::getSign($arr, $config[&#39;key&#39;]);
    return $arr;
  }


  public function notify()
  {
    $config = array(
      &#39;mch_id&#39; => $this->mchid,
      &#39;appid&#39; => $this->appid,
      &#39;key&#39; => $this->apiKey,
    );
    $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

    $postObj = simplexml_load_string($postStr, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
    if ($postObj === false) {
      die(&#39;parse xml error&#39;);
    }
    if ($postObj->return_code != &#39;SUCCESS&#39;) {
      die($postObj->return_msg);
    }
    if ($postObj->result_code != &#39;SUCCESS&#39;) {
      die($postObj->err_code);
    }
    $arr = (array)$postObj;
    unset($arr[&#39;sign&#39;]);
    if (self::getSign($arr, $config[&#39;key&#39;]) == $postObj->sign) {
      echo &#39;<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>&#39;;
      return $postObj;
    }
  }

  /**
   * curl get
   *
   * @param string $url
   * @param array $options
   * @return mixed
   */
  public static function curlGet($url = &#39;&#39;, $options = array())
  {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }

  public static function curlPost($url = &#39;&#39;, $postData = &#39;&#39;, $options = array())
  {
    if (is_array($postData)) {
      $postData = http_build_query($postData);
    }
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }

  public static function createNonceStr($length = 16)
  {
    $chars = &#39;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&#39;;
    $str = &#39;&#39;;
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  public static 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 $xml;
  }
  /**
   * 获取签名
   */
  public static function getSign($params, $key)
  {
    ksort($params, SORT_STRING);
    $unSignParaString = self::formatQueryParaMap($params, false);
    $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
    return $signStr;
  }

  protected static function formatQueryParaMap($paraMap, $urlEncode = false)
  {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
      if (null != $v && "null" != $v) {
        if ($urlEncode) {
          $v = urlencode($v);
        }
        $buff .= $k . "=" . $v . "&";
      }
    }
    $reqPar = &#39;&#39;;
    if (strlen($buff) > 0) {
      $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
  }
}

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