php微信支付之公众号支付功能

/**

• 通过跳转获取用户的openid，跳转流程如下：
• 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
• 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
• @return 用户的openid
  */
  public function GetOpenid()
  {
  //通过code获得openid
  if (!isset($_GET['code'])){
  //触发微信返回code码
  $scheme = $_SERVER['HTTPS']=='on' ? 'https://' : 'http://';
  $baseUrl = urlencode($scheme.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].$_SERVER['QUERY_STRING']);
  $url = $this->__CreateOauthUrlForCode($baseUrl);
  Header("Location: $url");
  exit();
  } else {
  //获取code码，以获取openid
  $code = $_GET['code'];
  $openid = $this->getOpenidFromMp($code);
  return $openid;
  }
  }

/**

• 通过code从工作平台获取openid机器access_token
• @param string $code 微信跳转回来带上的code
• @return openid
  */
  public function GetOpenidFromMp($code)
  {
  $url = $this->__CreateOauthUrlForOpenid($code);
  $res = self::curlGet($url);
  //取出openid
  $data = json_decode($res,true);
  $this->data = $data;
  $openid = $data['openid'];
  return $openid;
  }

/**

• 构造获取open和access_toke的url地址
• @param string $code，微信跳转带回的code
• @return 请求的url
  */
  private function __CreateOauthUrlForOpenid($code)
  {
  $urlObj["appid"] = $this->appid;
  $urlObj["secret"] = $this->appKey;
  $urlObj["code"] = $code;
  $urlObj["grant_type"] = "authorization_code";
  $bizString = $this->ToUrlParams($urlObj);
  return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
  }

/**

• 构造获取code的url连接
• @param string $redirectUrl 微信服务器回跳的url，需要url编码
• @return 返回构造好的url
  */
  private function __CreateOauthUrlForCode($redirectUrl)
  {
  $urlObj["appid"] = $this->appid;
  $urlObj["redirect_uri"] = "$redirectUrl";
  $urlObj["response_type"] = "code";
  $urlObj["scope"] = "snsapi_base";
  $urlObj["state"] = "STATE"."#wechat_redirect";
  $bizString = $this->ToUrlParams($urlObj);
  return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
  }

/**

• 拼接签名字符串
• @param array $urlObj
• @return 返回已经拼接好的字符串
  */
  private function ToUrlParams($urlObj)
  {
  $buff = "";
  foreach ($urlObj as $k => $v)
  {
  if($k != "sign") $buff .= $k . "=" . $v . "&";
  }
  $buff = trim($buff,"&");
  return $buff;
  }

/**

• 统一下单
• @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
• @param string $timestamp 支付时间
• @return string
  /
  public function createJsBizPackage($openid,$totalFee,$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,'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));
  $unifiedOrder = simplexml_load_string($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);
  }
  $arr = array(
  "appId" => $config['appid'],"timeStamp" => "$timestamp",//这里是字符串的时间戳，不是int，所以需加引号
  "nonceStr" => self::createNonceStr(),"package" => "prepay_id=" . $unifiedOrder->prepay_id,"signType" => 'MD5',);
  $arr['paySign'] = self::getSign($arr,$config['key']);
  return $arr;
  }

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_POST,CURLOPT_POSTFIELDS,$postData);
curl_setopt($ch,30); //设置cURL允许执行的最长秒数
if (!empty($options)) {
curl_setopt_array($ch,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)
{
$xml = "";
foreach ($arr as $key => $val) {
if (is_numeric($val)) {
$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
} else
$xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
}
$xml .= "";
file_put_contents('1.txt',$xml);
return $xml;
}

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,strlen($buff) - 1);
}
return $reqPar;
}
}
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