php实现微信原生支付（扫码支付）功能

网上的很多PHP微信扫码支付接入教程都颇为复杂，且需要配置和引入较多的文件，本人通过整理后给出一个单文件版的，只有200行代码，希望可以给各位想接入微信扫码支付的带来些许帮助和借鉴意义。

直接运行该文件即可得到一个支付二维码的图片。

需要注意的事项：

1.该文件需放到支付授权目录下，可以在微信支付商户平台->产品中心->开发配置中设置。
2.如提示签名错误可以通过微信支付签名验证工具进行验证：微信公众平台支付接口调试工具

代码如下：

<?phpheader('Content-type:text/html; Charset=utf-8');$mchid = 'xxxxx';     //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送$appid = 'xxxxx'; //公众号APPID 通过微信支付商户资料审核后邮件发送$apiKey = 'xxxxx';  //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥$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 = '支付测试';  //订单标题$notifyUrl = 'https://www.xxx.com/wx/';   //付款成功后的回调地址(不要有问号)$payTime = time();   //付款时间$arr = $wxPay->createJsBizPackage($payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);//生成二维码$url = 'http://qr.liantu.com/api.php?text='.$arr['code_url'];echo "<img src='{$url}' style='width:300px;'>";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(      'mch_id' => $this->mchid,      'appid' => $this->appid,      'key' => $this->apiKey,    );    $orderName = iconv('GBK','UTF-8',$orderName);    $unified = array(      'appid' => $config['appid'],      'attach' => 'pay',       //商家数据包，原样返回，如果填写中文，请注意转换为utf-8      'body' => $orderName,      'mch_id' => $config['mch_id'],      'nonce_str' => self::createNonceStr(),      'notify_url' => $notifyUrl,      'out_trade_no' => $outTradeNo,      'spbill_create_ip' => '127.0.0.1',      'total_fee' => intval($totalFee * 100),    //单位 转为分      'trade_type' => 'NATIVE',    );    $unified['sign'] = self::getSign($unified, $config['key']);    $responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));    $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);    if ($unifiedOrder === false) {      die('parse xml error');    }    if ($unifiedOrder->return_code != 'SUCCESS') {      die($unifiedOrder->return_msg);    }    if ($unifiedOrder->result_code != 'SUCCESS') {      die($unifiedOrder->err_code);    }    $codeUrl = (array)($unifiedOrder->code_url);    if(!$codeUrl[0]) exit('get code_url error');    $arr = array(      "appId" => $config['appid'],      "timeStamp" => $timestamp,      "nonceStr" => self::createNonceStr(),      "package" => "prepay_id=" . $unifiedOrder->prepay_id,      "signType" => 'MD5',      "code_url" => $codeUrl[0],    );    $arr['paySign'] = self::getSign($arr, $config['key']);    return $arr;  }  public function notify()  {    $config = array(      'mch_id' => $this->mchid,      'appid' => $this->appid,      'key' => $this->apiKey,    );    $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);    if ($postObj === false) {      die('parse xml error');    }    if ($postObj->return_code != 'SUCCESS') {      die($postObj->return_msg);    }    if ($postObj->result_code != 'SUCCESS') {      die($postObj->err_code);    }    $arr = (array)$postObj;    unset($arr['sign']);    if (self::getSign($arr, $config['key']) == $postObj->sign) {      echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';      return $postObj;    }  }  /**   * curl get   *   * @param string $url   * @param array $options   * @return mixed   */  public static function curlGet($url = '', $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 = '', $postData = '', $options = array())  {    if (is_array($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 = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';    $str = '';    for ($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 . "&";      }    }    $reqPar = '';    if (strlen($buff) > 0) {      $reqPar = substr($buff, 0, strlen($buff) - 1);    }    return $reqPar;  }}