一切尽在代码中，代码附有注释，欢迎大家参考。

<?phpclass WxpayService{  protected $mchid;  protected $appid;  protected $key;  public function __construct($mchid, $appid, $key)  {    $this->mchid = $mchid; // 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    $this->appid = $appid; //公众号APPID 通过微信支付商户资料审核后邮件发送    $this->key = $key;   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥  }  /**   * @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid   * @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 $notifyUrl 支付结果通知url 不要有问号   *   https://mp.weixin.qq.com/ 微信支付-开发配置-测试目录   *   测试目录 http://mp.izhanlue.com/paytest/  最后需要斜线，(需要精确到二级或三级目录)   * @return string   */  public function createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)  {    $config = array(      "mch_id" => $this->mchid,      "appid" => $this->appid,      "key" => $this->key,    );    $unified = array(      "appid" => $config["appid"],      "attach" => "支付",             //商家数据包，原样返回      "body" => $orderName,      "mch_id" => $config["mch_id"],      "nonce_str" => self::createNonceStr(),      "notify_url" => $notifyUrl,      "openid" => $openid,            //rade_type=JSAPI，此参数必传      "out_trade_no" => $outTradeNo,      "spbill_create_ip" => "127.0.0.1",      "total_fee" => intval($totalFee * 100),       //单位 转为分      "trade_type" => "JSAPI",    );    $unified["sign"] = self::getSign($unified, $config["key"]);    $responseXml = self::curlPost("https://api.mch.weixin.qq.com/pay/unifiedorder", self::arrayToXml($unified));    /*    <xml>    <return_code><![CDATA[SUCCESS]]></return_code>    <return_msg><![CDATA[OK]]></return_msg>    <appid><![CDATA[wx00e5904efec77699]]></appid>    <mch_id><![CDATA[1220647301]]></mch_id>    <nonce_str><![CDATA[1LHBROsdmqfXoWQR]]></nonce_str>    <sign><![CDATA[ACA7BC8A9164D1FBED06C7DFC13EC839]]></sign>    <result_code><![CDATA[SUCCESS]]></result_code>    <prepay_id><![CDATA[wx2015032016590503f1bcd9c30421762652]]></prepay_id>    <trade_type><![CDATA[JSAPI]]></trade_type>    </xml>    */    $unifiedOrder = simplexml_load_string($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($unifiedOrder->err_code);      /*      NOAUTH 商户无此接口权限      NOTENOUGH 余额不足      ORDERPAID 商户订单已支付      ORDERCLOSED 订单已关闭      SYSTEMERROR 系统错误      APPID_NOT_EXIST   APPID不存在      MCHID_NOT_EXIST MCHID不存在      APPID_MCHID_NOT_MATCH appid和mch_id不匹配      LACK_PARAMS 缺少参数      OUT_TRADE_NO_USED 商户订单号重复      SIGNERROR 签名错误      XML_FORMAT_ERROR XML格式错误      REQUIRE_POST_METHOD 请使用post方法      POST_DATA_EMPTY post数据为空      NOT_UTF8 编码格式错误      */    }    //$unifiedOrder->trade_type 交易类型 调用接口提交的交易类型，取值如下：JSAPI，NATIVE，APP    //$unifiedOrder->prepay_id 预支付交易会话标识 微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时    //$unifiedOrder->code_url 二维码链接 trade_type为NATIVE是有返回，可将该参数值生成二维码展示出来进行扫码支付    $arr = array(      "appId" => $config["appid"],      "timeStamp" => $timestamp,      "nonceStr" => self::createNonceStr(),      "package" => "prepay_id=" . $unifiedOrder->prepay_id,      "signType" => "MD5",    );    $arr["paySign"] = self::getSign($arr, $config["key"]);    return $arr;  }  public function notify()  {    $config = array(      "mch_id" => $this->mchid,      "appid" => $this->appid,      "key" => $this->key,    );    $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];    //error_log($postStr, 3, "./str.txt");    /*    $postStr = "<xml>    <appid><![CDATA[wx00e5904efec77699]]></appid>    <attach><![CDATA[支付测试]]></attach>    <bank_type><![CDATA[CMB_CREDIT]]></bank_type>    <cash_fee><![CDATA[1]]></cash_fee>    <fee_type><![CDATA[CNY]]></fee_type>    <is_subscribe><![CDATA[Y]]></is_subscribe>    <mch_id><![CDATA[1220647301]]></mch_id>    <nonce_str><![CDATA[a0tZ41phiHm8zfmO]]></nonce_str>    <openid><![CDATA[oU3OCt5O46PumN7IE87WcoYZY9r0]]></openid>    <out_trade_no><![CDATA[550bf2990c51f]]></out_trade_no>    <result_code><![CDATA[SUCCESS]]></result_code>    <return_code><![CDATA[SUCCESS]]></return_code>    <sign><![CDATA[F6F519B4DD8DB978040F8C866C1E6250]]></sign>    <time_end><![CDATA[20150320181606]]></time_end>    <total_fee>1</total_fee>    <trade_type><![CDATA[JSAPI]]></trade_type>    <transaction_id><![CDATA[1008840847201503200034663980]]></transaction_id>    </xml>";    */    $postObj = simplexml_load_string($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) {      // $mch_id = $postObj->mch_id; //微信支付分配的商户号      // $appid = $postObj->appid; //微信分配的公众账号ID      // $openid = $postObj->openid; //用户在商户appid下的唯一标识      // $transaction_id = $postObj->transaction_id;//微信支付订单号      // $out_trade_no = $postObj->out_trade_no;//商户订单号      // $total_fee = $postObj->total_fee; //订单总金额，单位为分      // $is_subscribe = $postObj->is_subscribe; //用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效      // $attach = $postObj->attach;//商家数据包，原样返回      // $time_end = $postObj->time_end;//支付完成时间      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 $xml;  }  /**   * 例如：   * appid：  wxd930ea5d5a258f4f   * mch_id：  10000100   * device_info： 1000   * Body：  test   * nonce_str： ibuaiVcKdpRxkhJA   * 第一步：对参数按照 key=value 的格式，并按照参数名 ASCII 字典序排序如下：   * stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_i   * d=10000100&nonce_str=ibuaiVcKdpRxkhJA";   * 第二步：拼接支付密钥：   * stringSignTemp="stringA&key=192006250b4c09247ec02edce69f6a2d"   * sign=MD5(stringSignTemp).toUpperCase()="9A0A8659F005D6984697E2CA0A9CF3B7"   */  public static function getSign($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;  }}

以上代码大家都能看得懂吧，有哪里不明白的地方欢迎给我留言，我会在第一时间和大家取得联系的。谢谢大家对网页设计网站的支持。