PHP实现 APP端微信支付功能

class Wxpayandroid
{
 //参数配置
 public $config = array(
    'appid' => "", /*微信开放平台上的应用id*/
    'mch_id' => "", /*微信申请成功之后邮件中的商户id*/
    'api_key' => "", /*在微信商户平台上自己设定的api密钥 32位*/
   );
 //服务器异步通知页面路径(必填)
 public $notify_url = '';
 //商户订单号(必填，商户网站订单系统中唯一订单号)
 public $out_trade_no = '';
 //商品描述(必填，不填则为商品名称)
 public $body = '';
 //付款金额(必填)
 public $total_fee = 0;
 //自定义超时(选填，支持dhmc)
 public $time_expire = '';
 private $WxPayHelper;
 public function Weixinpayandroid($total_fee,$tade_no)
 {
  $this->total_fee = intval($total_fee * 100);//订单的金额 1元
  $this->out_trade_no = $tade_no;// date('YmdHis') . substr(time(), - 5) . substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 99));//订单号
  $this->body = 'wxpay';//支付描述信息
  $this->time_expire = date('YmdHis', time() + 86400);//订单支付的过期时间(eg:一天过期)
  $this->notify_url = "http://www.ceshi.com/notifyandroid";//异步通知URL(更改支付状态)
  //数据以JSON的形式返回给APP
  $app_response = $this->doPay(); 
  if (isset($app_response['return_code']) && $app_response['return_code'] == 'FAIL') {
   $errorCode = 100;
   $errorMsg = $app_response['return_msg'];
   $this->echoResult($errorCode, $errorMsg);
  } else {
   $errorCode = 0;
   $errorMsg = 'success';
   $responseData = array(
    'notify_url' => $this->notify_url,
    'app_response' => $app_response,
   );
   $this->echoResult($errorCode, $errorMsg, $responseData);
  }
 }
 //接口输出
 function echoResult($errorCode = 0, $errorMsg = 'success', $responseData = array())
 {
  $arr = array(
   'errorCode' => $errorCode,
   'errorMsg' => $errorMsg,
   'responseData' => $responseData,
  );
   exit(json_encode($arr));  //exit可以正常发送给APP json数据
  // return json_encode($arr); //在TP5中return这个json数据，APP接收到的是null,无法正常吊起微信支付
 }
 function getVerifySign($data, $key)
 {
  $String = $this->formatParameters($data, false);
  //签名步骤二：在string后加入KEY
  $String = $String . "&key=" . $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 $result;
 }
 function formatParameters($paraMap, $urlencode)
 {
  $buff = "";
  ksort($paraMap);
  foreach ($paraMap as $k => $v) {
   if($k=="sign"){
    continue;
   }
   if ($urlencode) {
    $v = urlencode($v);
   }
   $buff .= $k . "=" . $v . "&";
  }
  $reqPar;
  if (strlen($buff) > 0) {
   $reqPar = substr($buff, 0, strlen($buff) - 1);
  }
  return $reqPar;
 }
 /**
  * 得到签名
  * @param object $obj
  * @param string $api_key
  * @return string
  */
 function getSign($obj, $api_key)
 {
  foreach ($obj as $k => $v)
  {
   $Parameters[strtolower($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 = $String."&key=".$api_key;
  //签名步骤三：MD5加密
  $result = strtoupper(md5($String));
  return $result;
 }
 /**
  * 获取指定长度的随机字符串
  * @param int $length
  * @return Ambigous <NULL, string>
  */
 function getRandChar($length){
  $str = null;
  $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
  $max = strlen($strPol)-1;
  for($i=0;$i<$length;$i++){
   $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
  }
  return $str;
 }
 /**
  * 数组转xml
  * @param array $arr
  * @return string
  */
 function arrayToXml($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;
 }
 /**
  * 以post方式提交xml到对应的接口url
  *
  * @param string $xml 需要post的xml数据
  * @param string $url url
  * @param bool $useCert 是否需要证书，默认不需要
  * @param int $second url执行超时时间，默认30s
  * @throws WxPayException
  */
 function postXmlCurl($xml, $url, $second=30, $useCert=false, $sslcert_path='', $sslkey_path='')
 {
  $ch = curl_init();
  //设置超时
  curl_setopt($ch, CURLOPT_TIMEOUT, $second);
  curl_setopt($ch,CURLOPT_URL, $url);
  //设置header
  curl_setopt($ch, CURLOPT_HEADER, FALSE);
  //要求结果为字符串且输出到屏幕上
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
  curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
  curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
  if($useCert == true){
   curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE);
   curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//严格校验
   //设置证书
   //使用证书：cert 与 key 分别属于两个.pem文件
   curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
   curl_setopt($ch,CURLOPT_SSLCERT, $sslcert_path);
   curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
   curl_setopt($ch,CURLOPT_SSLKEY, $sslkey_path);
  }
  //post提交方式
  curl_setopt($ch, CURLOPT_POST, TRUE);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
  //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($ch);
   return false;
  }
 }
 /**
  * 获取当前服务器的IP
  * @return Ambigous <string, unknown>
  */
 function get_client_ip()
 {
  if (isset($_SERVER['REMOTE_ADDR'])) {
   $cip = $_SERVER['REMOTE_ADDR'];
  } elseif (getenv("REMOTE_ADDR")) {
   $cip = getenv("REMOTE_ADDR");
  } elseif (getenv("HTTP_CLIENT_IP")) {
   $cip = getenv("HTTP_CLIENT_IP");
  } else {
   $cip = "127.0.0.1";
  }
  return $cip;
 }
 /**
  * 将数组转成uri字符串
  * @param array $paraMap
  * @param bool $urlencode
  * @return string
  */
 function formatBizQueryParaMap($paraMap, $urlencode)
 {
  $buff = "";
  ksort($paraMap);
  foreach ($paraMap as $k => $v)
  {
   if($urlencode)
   {
    $v = urlencode($v);
   }
   $buff .= strtolower($k) . "=" . $v . "&";
  }
  $reqPar;
  if (strlen($buff) > 0)
  {
   $reqPar = substr($buff, 0, strlen($buff)-1);
  }
  return $reqPar;
 }
 /**
  * XML转数组
  * @param unknown $xml
  * @return mixed
  */
 function xmlToArray($xml)
 {
  //将XML转为array
  $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
  return $array_data;
 }
 public function chkParam()
 {
  //用户网站订单号
  if (empty($this->out_trade_no)) {
   die('out_trade_no error');
  } 
  //商品描述
  if (empty($this->body)) {
   die('body error');
  }
  if (empty($this->time_expire)){
   die('time_expire error');
  }
  //检测支付金额
  if (empty($this->total_fee) || !is_numeric($this->total_fee)) {
   die('total_fee error');
  }
  //异步通知URL
  if (empty($this->notify_url)) {
   die('notify_url error');
  }
  if (!preg_match("#^http:\/\/#i", $this->notify_url)) {
   $this->notify_url = "http://" . $_SERVER['HTTP_HOST'] . $this->notify_url;
  }
  return true;
 }
 /**
  * 生成支付(返回给APP)
  * @return boolean|mixed
  */
 public function doPay() {
  //检测构造参数
  $this->chkParam();
  return $this->createAppPara();
 }
 /**
  * APP统一下单
  */
 private function createAppPara()
 {
  $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
  $data["appid"]  = $this->config['appid'];//微信开放平台审核通过的应用APPID
  $data["body"]   = $this->body;//商品或支付单简要描述
  $data["mch_id"]  = $this->config['mch_id'];//商户号
  $data["nonce_str"] = $this->getRandChar(32);//随机字符串
  $data["notify_url"] = $this->notify_url;//通知地址
  $data["out_trade_no"] = $this->out_trade_no;//商户订单号
  $data["spbill_create_ip"] = $this->get_client_ip();//终端IP
  $data["total_fee"]  = $this->total_fee;//总金额
  $data["time_expire"]  = $this->time_expire;//交易结束时间
  $data["trade_type"]  = "APP";//交易类型
  $data["sign"]    = $this->getSign($data, $this->config['api_key']);//签名
  $xml  = $this->arrayToXml($data);
  $response = $this->postXmlCurl($xml, $url);
  //将微信返回的结果xml转成数组
  $responseArr = $this->xmlToArray($response);
  if(isset($responseArr["return_code"]) && $responseArr["return_code"]=='SUCCESS'){
   return $this->getOrder($responseArr['prepay_id']);
  }
  return $responseArr;
 }
 /**
  * 执行第二次签名，才能返回给客户端使用
  * @param int $prepayId:预支付交易会话标识
  * @return array
  */
 public function getOrder($prepayId)
 {
  $data["appid"]  = $this->config['appid'];
  $data["noncestr"] = $this->getRandChar(32);
  $data["package"] = "Sign=WXPay";
  $data["partnerid"] = $this->config['mch_id'];
  $data["prepayid"] = $prepayId;
  $data["timestamp"] = time();
  $data["sign"]  = $this->getSign($data, $this->config['api_key']);
  $data["packagestr"] = "Sign=WXPay";
  return $data;
 }
 /**
  * 异步通知信息验证
  * @return boolean|mixed
  */
 public function verifyNotify()
 {
  $xml = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : ''; 
  if(!$xml){
   return false;
  }
  $wx_back = $this->xmlToArray($xml);
  if(empty($wx_back)){
   return false;
  }
  $checkSign = $this->getVerifySign($wx_back, $this->config['api_key']); 
  if($checkSign=$wx_back['sign']){
   return $wx_back;
  }else{
   return false;
  } 
 }
}

//异步通知接口
 public function notifyandroid()
 {
  $wxpayandroid = new \Wxpayandroid;  //实例化微信支付类
  $verify_result = $wxpayandroid->verifyNotify();
  if ($verify_result['return_code']=='SUCCESS' && $verify_result['result_code']=='SUCCESS') {
  　　//商户订单号
  　　$out_trade_no = $verify_result['out_trade_no'];
  　　//交易号
  　　$trade_no  = $verify_result['transaction_id'];
  　　//交易状态
  　　$trade_status = $verify_result['result_code'];
  　　//支付金额
  　　$total_fee = $verify_result['total_fee']/100;
  　　//支付过期时间
  　　$pay_date  = $verify_result['time_end'];
  　　$order = new Order();
  　　$ret = $order->getOrderN2($out_trade_no); //获取订单信息
  　　$total_amount=$ret['money'];
  　　if ($total_amount==$total_fee) {
   　　// 验证成功 修改数据库的订单状态等 $result['out_trade_no']为订单号
   　　//此处写自己的逻辑代码
  　　}
   exit('<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>');
  }else{
   exit('<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[ERROR]]></return_msg></xml>');
  }
 }
 
 //调用统一下单接口生成预支付订单并把数据返回给APP
 public function wxpayandroid(Request $request)
 {
  $param = $request->param(); //接收值
 
  $tade_no = $param['orderCode'];
  $order = new Order(); //实例化订单
  $ret = $order->getOrderN2($tade_no); //查询订单信息
  $total_fee = $ret['money']; //订单总金额
  
  $wxpayandroid = new \Wxpayandroid;  //实例化微信支付类
  $res = $wxpayandroid->Weixinpayandroid($total_fee,$tade_no); //调用weixinpay方法
  
 }