PHP实现 APP端微信支付功能

前面已经写了手机APP支付宝支付，今天再把手机APP微信支付补上，前期的准备工作在这里就不多说了，可以参考微信支付开发文档，一定要仔细阅读开发文档，可以让你少踩点坑；准备工作完成后就是配置参数,调用统一下单接口,支付后异步回调三部曲啦；

1.我封装好的一个支付类文件,多余的东西都去除掉了,并且把配置参数放到了这个支付类中,只需要修改Weixinpayandroid方法内的几个参数就可以直接复制使用:

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;  }  }}